The fundamental difference
A laser measures. You point it, it times a laser pulse to the target and back, and tells you the distance to whatever you aimed at. It has no idea what course you're on and doesn't need to.
A GPS looks things up. It knows where you are on the planet and compares that to stored map data for the course, giving distances to mapped features — usually the front, middle and back of the green.
That difference explains everything else about how they behave.
Why the pin position matters
Greens are large. The flag is moved to a different spot on the green every day or two, to spread the wear on the turf.
A laser measures to the flag as it is today. A GPS knows where the green is but not where the flag has been placed on it, which on a deep green can be a difference of 20 or 30 yards — two or three clubs.
This is the laser's core advantage and the reason serious golfers tend to carry one.
Why a GPS is easier
No aiming. A golfer glances at their wrist and has three numbers.
A laser has to be held steady enough to hit a flagstick a couple of inches wide at 150 yards, which takes a moment's practice and can be genuinely awkward for someone with unsteady hands. It also has to be taken out of a pouch each time.
For an older golfer, a beginner, or anyone who'd find a device fiddly, the GPS is more likely to actually get used — which matters more than which one is theoretically better.
The hidden differences
Battery. A laser runs for months on one small battery. A GPS watch needs charging every few rounds, which is one more thing to remember.
Course coverage.A GPS only helps on courses in its database. Coverage is very good — the major brands publish figures in the tens of thousands of courses — but it's worth checking if the recipient plays somewhere obscure. A laser works anywhere, including on a driving range.
Off-course use. A GPS watch can be worn as an everyday watch, which is a genuine advantage for a gift — it gets used daily rather than dug out on Saturdays.
The rules point
Both are permitted for distance measurement in competition. Neither may be used to gauge elevation change — the "slope" function — which is why lasers have a visible slope switch and GPS devices have a tournament mode. The rule in full.
Which to buy as a gift
Laserfor a golfer who takes their score seriously, plays unfamiliar courses, or would enjoy the precision. It's the more "golf" gift and the one most golfers would choose.
GPS watchfor someone who'd find aiming a device fiddly, wants simplicity, or would like something wearable off the course.
Not both.Some golfers do carry both, but as a gift that's a lot of money on overlapping function. Pick one. Our rangefinder guide covers both categories.