The Quick Verdict
This one genuinely depends on how you play. If you want full-hole strategy, course management, and a device you'll use every single round without thinking about it, get the S70. If you want dead-accurate pin distance and a rangefinder that's smarter than most because it shows you the entire hole through the viewfinder, get the Z82. But here's the honest answer for a lot of golfers: these two are designed to work together. The S70 on your wrist, the Z82 in your pocket — that's the Garmin ecosystem firing on all cylinders. Combined, you're looking at $1,300. That's real money, but it's not an unreasonable setup if you're serious about your game.
What They Actually Do
The S70 is a 47mm smartwatch that lives on your wrist and gives you continuous course information — hole maps, hazards, distances, wind, virtual caddie suggestions — without you ever pulling it out. The Z82 is a laser rangefinder with a trick up its sleeve: it overlays a full-color GPS course map in the viewfinder alongside the laser reading. Both are Garmin products, both live in the Garmin Golf app, and both are legal for tournament play with slope disabled.
The Real Tradeoffs
Precision vs. convenience
The Z82 is accurate within 10 inches at the pin. Ten inches. The S70 gives you front, center, and back of the green — useful, but it's a fixed point, not your specific flag position on a Tuesday afternoon when the pin is tucked back-left. For approach shots where 8 yards is the difference between a birdie look and a bunker, the rangefinder wins the precision argument easily. For tee shots, layup yardages, or figuring out if you can carry that fairway bunker — pull up your wrist. You're not lasing a fairway bunker.
Speed of use
The S70 wins every time you'd lose a step reaching into your bag. Glance down. You've got yardage, wind, and a hazard layout before your playing partner finishes his practice swing. The Z82 requires pulling it out, finding the flag through the scope, locking on, reading the display, and putting it away. That's fine when you need precision. It's friction when you just need a quick number on a 220-yard par 3 tee.
What you see before you hit
This is where the category difference is starkest. The S70 shows you the whole hole before you make any decision. Standing on a tee box you've never seen — 420-yard dogleg right, trees cutting into your line at 240, water short-right of the green — the watch maps all of it. You know where to miss, where to layup, what the smart shot is. The Z82's GPS overlay in the viewfinder is genuinely impressive for a rangefinder, but it's showing you course layout in a scope you're already pointing at something. That's not the same as glancing at a full hole map on your wrist before you pull a club.
The Z82 cannot show you green contours. It can't tell you the pin is on a shelf and that a shot landing past it will feed off the green. The S70 can — with a Garmin Golf membership.
The ecosystem connection
Both products use the Garmin Golf app, and your Z82 data syncs into the same ecosystem your S70 lives in. Your round history, course information, and performance data all feed into one place. This is a real advantage of going same-brand. If you're pairing products from different manufacturers, you're managing two apps and two data silos. Here, you're not.
Cost of ownership
The S70 is $699.99. The Z82 is $599.99. The S70's best features — green contours, enhanced maps, touch targeting — require a Garmin Golf membership at $99.99/year. That's $799+ in year one for the S70 with full capability. The Z82 has no subscription. Both are rechargeable, so no ongoing battery cost for either. Over three years, that membership adds roughly $300 to the S70's total cost. Worth it for what it unlocks, but worth knowing.
Tournament legality
Both have slope mode and both have a way to disable it for competition. The S70 has a dedicated tournament mode. The Z82 has a tournament mode that disables slope — confirmed. Neither will get you DQ'd as long as you flip the switch before your tee time.
Who Should Get Which
Get the S70 if you play different courses regularly, you want course management built into your round rather than bolted on, or you care about shot tracking, strokes gained, and understanding where your game is actually leaking. Also the move if you want a watch you'll wear every day that happens to be a serious golf computer.
Get the Z82 if you already have a GPS device you like, you want the most accurate pin yardage possible, or you're drawn to the idea of a rangefinder that also shows you the hole layout without pulling up a separate app. It's a rangefinder first — a very smart one — but a rangefinder.
Get both if you're a sub-15 handicap who takes course management seriously and wants every advantage available during a round. The S70 handles the strategic picture — hazard carries, layup windows, club suggestions based on wind and elevation. The Z82 confirms the exact number when it's time to pull the trigger on an approach. This is genuinely how better players use both categories together, and with Garmin's shared ecosystem, it's less redundant than it sounds.
The Bottom Line
If you're picking one: the S70 does more and manages your whole round in a way the Z82 simply can't. But the Z82 does its one job with a precision the watch will never match — and it's the smarter rangefinder on the market. If the budget allows, the best answer is both.
Get both. The S70 on your wrist, the Z82 in your bag.