The Quick Verdict
These two are priced essentially the same — four cents apart — so the decision comes down to what you actually want from a rangefinder. Get the Nikon COOLSHOT 50i GII. It reaches flags out to about 400 yards against the Z10's 350, and its CR2 is rated for about 10,000 measurements. I'd also guess its red OLED is the easier of the two to pick out in low light, though I haven't had them side by side. The Garmin Z10 is the pick only if you're already in the Garmin ecosystem and the Range Relay or Find My Garmin features would actually get used. Check price at Amazon →
What They Have in Common
Both land at about $300 ($299.99 for the Garmin, $299.95 for the Nikon), both shoot to ±1 yard accuracy, both run on a CR2 battery, both carry IPX4 water resistance, and both offer 6x magnification with slope mode that can be toggled off for tournament play. Cart magnets on each. They're competing for the exact same shelf space at the exact same price, which makes the real differences meaningful.
Where They Differ
Display Technology
The Z10 uses a transparent PDLC display with a black readout, while the COOLSHOT 50i GII uses a red internal OLED. Nobody reads a rangefinder in perfect lighting conditions; you're usually squinting into a fairway at 7am or trying to read it in a cart's shadow. I'd guess a red OLED is easier to pick out in those conditions than a black readout against a dark background, but I haven't tested the two head to head.
Optics and Build
The COOLSHOT 50i GII lists what Nikon calls HYPER READ, Dual LOCKED ON QUAKE and First Target Priority; the Z10 lists vibration lock. The more concrete differences are elsewhere: Nikon rates its CR2 for about 10,000 measurements against Garmin's "up to 1 year", the Nikon reaches flags at about 400 yards against the Z10's 350, and the Z10 is the lighter of the two at 6.3 oz against 7.2 oz.
Connectivity and Smart Features
Here's where the Z10 earns its Garmin badge. It has Bluetooth, Range Relay (which sends ranged distances to a compatible Garmin watch, handheld or the Garmin Golf app), and Find My Garmin if you leave it on the cart. If you play with a Garmin GPS watch and want your rangefinder reading to show up on your wrist, the Z10 does that. If you don't use any of that, you're paying for features that sit unused. Nikon doesn't list Bluetooth or an app for the COOLSHOT 50i GII — it measures, it displays, done.
Warranty
The Nikon comes with a 5-year warranty. I couldn't confirm Garmin's warranty for the Z10.
Who Should Buy Which
Get the Nikon COOLSHOT 50i GII if:
- You want a clean, standalone rangefinder that doesn't need to talk to anything else — just point, shoot, read
- You're the golfer who plays early Saturday mornings in low-contrast light and would rather have a red OLED readout than a black one
- You want the longer flag range (about 400 yards) and a battery rated for about 10,000 measurements at the same price as the Garmin
Get the Garmin Approach Z10 if:
- You already wear a Garmin GPS watch and you'd genuinely use the Range Relay to push distances to your wrist mid-round
- Find My Garmin is meaningful to you — if you've already left gear on a cart, you know
- You want the lighter unit — 6.3 oz against the Nikon's 7.2 oz — and PlaysLike Distance with a tournament-mode light that shows when it's switched off
The Bottom Line
At a four-cent price difference, this isn't a budget call. It's a feature call. The Nikon COOLSHOT 50i GII wins on flag range and battery life. The Garmin Z10 is lighter, but its biggest advantages are ecosystem-specific — you need to already use a Garmin watch, handheld or the Garmin Golf app to justify choosing it over the Nikon here. If you're not, the Nikon is the better standalone rangefinder at the same price.