The Quick Verdict
This one genuinely depends on how you play. If you want full course intelligence — hole layouts, hazard distances, shot tracking, and a watch you can wear all week — get the S50. If you primarily want one thing done perfectly (exact distance to the pin, every time), the Z30 delivers that for $170 less. But here's the honest answer for a lot of golfers: these two are better together. The Z30 has Range Relay, which sends its laser measurement directly to the S50 on your wrist. At $629 combined, you're getting a genuinely complete distance system.
What They Actually Do
The S50 is a GPS smartwatch that shows you preloaded maps of 43,000 courses, with distances to the front, center, and back of every green — plus hazards, hole layouts, shot tracking, and everyday smartwatch features. The Z30 is a laser rangefinder: you point it at a flag, press a button, and get the exact distance within ±1 meter. Both are legal in tournament play (both have slope modes that can be disabled). Both are Garmin products that connect to the Garmin Golf app.
The Real Tradeoffs
Precision vs. convenience
The Z30 gives you exact distance to whatever you're pointing at — the flag, a bunker lip, a tree you want to lay up short of. We're talking ±1 yard to a specific target. The S50 gives you front/center/back of the green, which is accurate enough for most shots but doesn't know where the pin is cut today. For approach shots where the difference between front pin and back pin is 15 yards, the rangefinder has a real edge. For everything else — tee shots, layups, hazard carries — glancing at your wrist is faster and often more informative.
Speed of use
Standing on the tee box: glance at wrist, read the number, done. That's the S50. The Z30 means pulling it from your pocket, raising it to your eye, finding the flag through the scope, pressing the button, reading the display, putting it away. On a slow round where pace of play is already an issue, that adds up. The watch wins on convenience every single time. The rangefinder wins when you need a specific number to a specific target, and convenience isn't the point.
What you can see before you pull the trigger
This is where the S50 does something the Z30 simply cannot do. You're on a tee box you've never played — 385-yard par 4, water down the right, bunkers at 220 in the left rough. The S50 shows you all of it on a color hole map. You can see exactly how far to carry the water, where the fairway opens up, how deep the green is. The Z30 is useless here — there's no flag to point at, and it has no idea what the hole looks like.
Flip it around: you've striped your drive and you're 163 yards out with a back-left tucked pin. The S50 tells you center is 163, back is 175. But you want to know exactly how far to that flag, especially with a slope that might affect the playslike distance. Point the Z30, get 168, pick your club. That's the rangefinder's moment.
The Range Relay feature (same-brand advantage)
This is unique to pairing these two products. The Z30 can relay its laser measurement to the S50 via Bluetooth, so when you range the flag, the exact distance appears right on your wrist. You don't have to read the rangefinder display — it just shows up where you're already looking. That's a genuinely useful feature for golfers who want rangefinder precision without breaking their workflow. Worth noting: the data confirms this feature exists, but you'll want to verify current app compatibility when you buy.
Cost of ownership
The S50 is $400, the Z30 is $229. The S50 has an optional Garmin Golf membership ($99.99/yr) that unlocks green contours and enhanced maps — useful, but not required. The Z30 runs on a CR2 battery rated for up to a year. No subscription, no charging, no cables. If the ongoing cost of a membership matters to you, factor in $300 over three years on top of the S50's purchase price.
Tournament legality
Both have slope modes and both have a way to disable them for competition. The S50 has a dedicated tournament mode. The Z30 has a tournament mode indicator. You're covered with either one.
Who Should Get Which
Get the S50 if you play a variety of courses and want to actually learn the layout before you get there, you like having shot tracking and scoring built into your wrist, you want a watch you'll wear Monday through Sunday (not just on the course), or you've never used a rangefinder and don't want to develop the habit of pulling one out mid-round.
Get the Z30 if you already know your home course cold and what you're really missing is exact pin distance on approach shots, you prefer a simple single-purpose tool, you don't want to charge another device every couple of rounds, or you want a capable rangefinder without spending $400.
Get both if you're serious enough about your game that you want both hole-level strategy AND pin-precise yardage — and the Range Relay feature actually appeals to you. At $629 combined, it's a legitimate setup. This is what a lot of 5-12 handicap players end up doing, and for good reason.
The Bottom Line
The S50 is the better single device for most golfers — more information, more versatility, more useful across an entire round. But the Z30 isn't competing on features; it's competing on doing one thing the watch can't do quite as well. If exact pin yardage is something you find yourself wanting on every approach, the Z30 fills that gap cleanly. And with Range Relay, these two are genuinely designed to work as a pair.
Get both. The S50 on your wrist, the Z30 in your pocket.