The rangefinder-versus-GPS argument usually gets framed as accuracy, which misses the point. A laser is more precise. A watch is faster. Which one you want depends on what's actually slowing you down.
What each one is for
A laser rangefinder gives you an exact distance to a specific target — the flag, a tree, the front edge of a bunker. Precise to a yard. You have to take it out, find the target and hold steady, which in wind or with shaky hands takes a moment.
A GPS watch gives you front, middle and back of the green the instant you look down. It doesn't know where the pin is. It knows where the green is, which most of the time is what you need.
The distinction that matters: a laser answers "how far to that flag." A watch answers "what club is this." Those are different questions and you ask the second one far more often.
Where a watch wins
Pace of play. This is the real argument. You glance at your wrist while walking to your ball and you already know the number. No stopping, no lasering, no queue for the one guy with the rangefinder.
Blind shots and dog-legs. Where you physically cannot see the flag, a laser is useless and GPS is the only answer.
Layups. "How far to carry that bunker" is a mapped-hazard question, which is a GPS question.
Walking. No extra thing to carry, drop, or leave on a tee box.
Where a laser wins
Approach shots where the exact pin matters. Front to back on a big green can be thirty yards — three clubs. If you're good enough for that to matter, you want the laser.
Elevation changes. Slope-adjusted lasers do the maths for you. (Slope mode is not permitted in competition — know the rule before you use it in one.)
Precision short game. Anything inside 120 where you're trying to land it on a specific yard.
What to look for in a watch
- Battery life in golf mode. The number that matters, and it's much lower than the general-use figure. You want it to survive 36 holes comfortably.
- Course coverage. Check your home course and anywhere you travel are actually mapped.
- Readability in sun. A screen you can't read at midday is useless. Look at it outdoors before buying.
- Auto hole advance. Manually clicking through 18 holes gets old fast.
- Wearability. If it's too bulky to wear every day, you'll leave it at home and forget to charge it.
- Shot tracking is the bonus feature that's quietly the most valuable — knowing your actual average 7-iron distance rather than your best-ever one changes how you club.
Which one
- Mid-handicapper
- Watch. More useful more often
- Low handicapper
- Laser, or both
- Blind or dog-leg holes
- GPS. A laser can't see round corners
- Hilly courses
- Slope-capable laser — but switch slope off in competition
- Pace of play
- Watch, clearly
- Check first
- Golf-mode battery life and whether your course is mapped
The unglamorous truth
Neither device will lower your handicap on its own. What a watch does is remove a decision and some faff, and let you play a bit quicker with slightly more confidence in your number.
The shot-tracking data is the part that might actually make you better — mostly by revealing that you hit your 7-iron ten yards shorter than you've been telling everyone.