A marathon is a thirty-thousand-step argument with your own body. At kilometre 32, the watch on your wrist either keeps the argument honest or it lies politely. Two watches were built for this exact moment: the Polar Vantage V3 at ₹62,995 and the Garmin Forerunner 965 at ₹69,990. Both speak fluent dual-band GPS. Both wear AMOLED faces that glow against a 5 a.m. Mumbai sky. One was made by a Finnish company obsessed with the science of recovery. The other by a Kansas City company that rewrote what a running watch is allowed to do. This is how to choose between them.
The verified specs, side by side
Numbers first. Opinions later. These are the figures Polar and Garmin publish for the Indian market in 2026.
| Spec | Polar Vantage V3 | Garmin Forerunner 965 |
|---|---|---|
| Tier | Ultra / triathlon / multi-day | Ultra / triathlon / multi-day |
| GPS battery | 61 hours | 31 hours |
| Smartwatch battery | 8 days | 23 days |
| Weight | 57 g | 53 g |
| GPS bands | Dual-band L1+L5 | Dual-band L1+L5 |
| Display | 1.39in AMOLED | 1.4in AMOLED |
| HRV tracking | Yes | Yes |
| Music storage | Yes | Yes |
| Contactless payments | No | Yes |
| Offline maps | Yes | Yes |
| India price | ₹62,995 | ₹69,990 |
Look at the table. Two watches that share dual-band L1+L5 GPS, AMOLED displays nearly the same size, HRV, music, and offline maps. Then look at the battery numbers and feel the personality difference. Polar gives you twice the GPS hours and a third of the smartwatch days. Garmin gives you a watch that lives on your wrist for three weeks at a time and dies faster when you ask it to track. Different philosophies. Same tier.
GPS accuracy where the city tries to confuse it
Dual-band L1+L5 is the reason both these watches cost what they cost. It is what separates them from the FR55 and the Active Edge in the cheaper tier. L1 and L5 frequencies arrive at the satellite from different angles, and the watch triangulates between them. The practical result, in a Bandra high-rise loop or a Connaught Place fartlek, is a GPS trace that follows the road you actually ran on, not the building you almost ran into.
Field tests in 2026 from third-party reviewers put both watches inside 1 to 2 percent pace accuracy at marathon distance on urban courses. The FR965 has a slight edge in deep urban canyons where Garmin's multi-frequency tuning is more mature. The Vantage V3 holds its own and is a small step ahead in dense forest cover, where Polar's algorithm is tuned for trail and ultra contexts. For most Indian road marathons — Mumbai, Tata Steel Kolkata, ADHM — both are accurate enough that the only person who will know the difference is the runner refreshing Strava at 3 a.m.
Battery for a marathon, an ultra, a week
Here is where the watches stop pretending to be the same product.
Sixty-one hours of GPS on the Polar Vantage V3 is enough for a 100-mile ultra at a slow finish, with a buffer. Thirty-one hours on the Garmin Forerunner 965 will cover a 100K, comfortably, but a 100-miler asks you to charge mid-race or to enable a battery-saver mode that strips features. If you are an ultra runner or a multi-day adventure racer, the Polar is engineered for your weekend. The Garmin is engineered for your week.
In smartwatch mode, the Garmin runs for 23 days and the Polar for 8. That ratio inverts everything. If you charge your watch on the bedside table on Sunday and you want it to last through to the following Saturday morning's long run without thinking about it, the FR965 is the cleaner experience. If you are willing to charge twice a week in exchange for a watch that can survive your most ambitious race, the Vantage V3 is the cleaner experience.
Neither watch is wrong. They were optimised for different runners. The question is which runner you are becoming.
Training metrics — what does the watch actually know about you?
Both watches have HRV tracking. Both have offline maps for navigation in unfamiliar terrain. Both have music storage so you can leave your phone at home. Both have running power on the wrist. The difference is the philosophy behind the data.
Polar built its reputation on recovery science. Vantage V3 gives you Recovery Pro, Nightly Recharge and Training Load Pro — a tightly engineered set of recovery signals that tells you, in the morning, whether your body is ready to absorb the workout you planned. It is the more conservative voice in your ear. It nudges you to rest when Garmin would let you run.
Garmin built its reputation on ecosystem. FR965 plugs into Garmin Connect, Connect IQ apps, and the largest running developer community in the world. Daily Suggested Workouts adapt to your training load. Race Predictor reads your VO2 max trend and tells you what a half marathon should feel like. Recovery Time Advisor is less scientifically tight than Polar's, but it sits inside a richer wider system. You get more, and the data is more interconnected.
The honest read: Polar's recovery science is sharper. Garmin's ecosystem is deeper. The training apps in STRIDD plan generator work with both — your plan lives outside the device, and the watch is the sensor that feeds it.
The small things that matter at kilometre 32
The FR965 weighs 53 grams. The Vantage V3 weighs 57. Four grams on the wrist over a four-hour marathon is real. Garmin wins the wrist test, narrowly.
Garmin has contactless payments through Garmin Pay, which is supported in India by a small but growing list of banks. Polar does not. If paying for an Electral and a banana at kilometre 32 from your wrist is a thing you want, the FR965 is the watch.
Garmin's third-party app ecosystem is wider. Polar's coaching app, Polar Flow, is cleaner and simpler. Garmin will give you more options. Polar will give you less to think about. Two valid design choices.
For deeper specs and India availability, the Polar Vantage V3 page and the Garmin FR965 page cover both in detail.
The verdict
If your next big goal is an ultra — anything from 50K upwards, or a multi-day adventure run — the Polar Vantage V3 wins. Sixty-one hours of GPS is the deciding number. Recovery Pro is the second. The Vantage V3 is the watch designed for the runner who races at the edge of what is humanly reasonable, and who needs to know each morning whether the body has caught up to the ambition.
If your next big goal is a fast road marathon, with a 23-day smartwatch life and a deep ecosystem you can grow into — the Garmin Forerunner 965 wins. Thirty-one hours of GPS is enough for any road race. Garmin Connect is the most mature running platform on the market. Garmin Pay, lighter weight, and a deeper app ecosystem all sit on the same wrist. For most Indian marathon runners, this is the watch.
One detail on Indian buying. For the Polar Vantage V3, buy from Polar India or authorised retailers — Polar's service network in India is concentrated in Mumbai, Bengaluru and Delhi, so verify warranty channels before purchase. For the Garmin FR965, buy from Garmin India, Garmin-branded retail or Decathlon Premium counters. Avoid grey-market imports for either watch; both come with 1-year India warranty when bought through verified channels. The wider watches comparison hub has the tier above and below if you want to see how these sit in the full ecosystem. The brand-specific Polar compare and Garmin compare pages stack each maker's range side by side. For a wider read on gear for Indian runners, start at Running Lab.