What They Have in Common
These two pull from the exact same Garmin Golf playbook. Both carry the full 43,000-course library, both run Virtual Caddie with wind and elevation AI, both have AutoShot detection, PlaysLike distances with barometer, green contours (behind the same $99.99/yr Garmin Golf membership), full-color hole maps, hazard view, strokes gained, slope mode, tournament mode, music storage, contactless payments, heart rate, sleep tracking, and USB-C charging. Same 1.4-inch AMOLED. Same 16-day watch battery. Same subscription structure. On a golf course, they're nearly twins.
Where They Differ
Battery Life
This is the real gap. The S70 gets 20 hours of GPS time — enough for two full rounds with room left over. The Fenix 8 gets 47 hours in GPS-only mode, or 38 hours with all satellite systems, or 35 hours with multi-band. That's the difference between "charges every couple of days" and "charges maybe twice a week if you're playing every day." For a golfer who plays weekend rounds, the S70's 20 hours never becomes a real-life problem. If you're also running ultras or doing multi-day hiking trips where you need GPS running continuously overnight, the Fenix 8's battery is genuinely transformative.
Weight & Water Resistance
The S70 weighs 56g. The Fenix 8 in stainless steel weighs 80g — 43% heavier. That's noticeable. Not swing-ruining, but noticeable at address and definitely noticeable by the back nine of a Sunday round. If you've never worn an 80g watch for four hours, it's not uncomfortable exactly, but it's there. The S70 tends to disappear on your wrist.
Water resistance goes the other way. The Fenix 8 is rated 10 ATM vs the S70's 5 ATM. For golf — rain, cart wash, maybe a recovery from a water hazard — 5 ATM is plenty. The 10 ATM matters if you're swimming laps or doing open-water swims as part of your training.
Multisport Platform
The Fenix 8 is Garmin's flagship multisport watch. Beyond golf, it carries full running dynamics (ground contact time, vertical oscillation, stride length), trail running maps, ski/snowboard profiles, rowing metrics, and serious dive/swim tracking. If you're an active person who logs training across multiple sports and wants one device to rule them all, the Fenix 8 earns its keep across the year. The S70 has fitness profiles and heart rate, but it's optimized for golf first. The Fenix 8 treats golf as one of twenty sports it handles expertly.
Price
$699.99 vs $1,099.99. That's a real $400. At the Fenix 8's price, you're in "is this for me or a gift" territory for a lot of golfers. Add the Garmin Golf membership at $99.99/yr and you're looking at $1,200 in year one for the Fenix 8 versus $800 for the S70 — if you want green contours on either. Over three years with membership, Fenix 8 totals ~$1,400. S70 totals ~$1,000. That $400 gap holds.
Who Should Buy Which
Buy the Approach S70 if:
- You're primarily a golfer who exercises but doesn't log serious mileage in other sports
- You prefer a lighter watch — 56g vs 80g matters over a four-hour round
- You want all the golf features at a lower price — same Virtual Caddie, same AutoShot, same green contours
- Two rounds between charges is fine — 20 GPS hours covers your needs without drama
- You're already spending $700 and don't want to stretch another $400 for features you won't use
Buy the Fenix 8 if:
- You're a serious multisport athlete — running, swimming, hiking, skiing — and want one watch for everything
- Battery anxiety is real for you — you play multiple rounds back-to-back, travel to golf trips, or do multi-day outdoor adventures where charging isn't convenient
- You need 10 ATM water resistance for actual swimming workouts, not just rain
- Weight is less of a concern than capability — you're used to wearing a substantial watch
- $1,100 fits your budget for a device you'll use daily across multiple sports year-round
The Bottom Line
On a golf course, these two watches are functionally the same. Same courses, same AI caddie, same shot tracking, same maps, same subscription unlock for green contours. The $400 price difference isn't buying you better golf features — it's buying you a multisport platform, 27 more hours of GPS, and deeper water resistance. If those extras match your life outside of golf, the Fenix 8 earns its price. For golfers who golf and exercise but aren't logging triathlon blocks, the S70 is the smarter buy. Don't pay $1,100 for capabilities you'll use twice a year.
Get the Approach S70.