Fenix 5S/5 Plus - 4.65 Beta Release

That’s not entirely correct. The Apple Watch can do VO2 max just like Garmin. And it is just about as accurate as Garmins devices it just doesn’t use first beat to do the calculations. The thing that aggravates me is that my friend that has a Apple Watch 3 and I have a Fenix 5+ titanium seems like it’s more accurate at gps than my Garmin we went for a run the other day and mine had a stupid moment where it had me running across our lake ( I didn’t know I could run on water) and my friend that has the Apple Watch had a really nice route. As a software engineer I’m really starting to think that Garmin only has junior developers working on their products and they don’t have any QA of any kind.
Never-the-less I like my Fenix I just wish they would actually do some QA before releasing software.

I think I can jump in here, having owned an Apple watch series 2, and 3, along with many Garmins, Suunto's, and Polar watches. I used to get all excited about the "sawtooth" tracks that were presented with virtually every watch I had, questing instead for the perfect watch that would give me a nice, smooth line right on the correct side of the path I was walking, or riding my bike. Alas, my friends, that's not going to happen, and here's why, and what I discovered.
GPS Signals are accurate within about 15 feet, although Galileo is supposed to be within about 3 feet if I remember correctly. So, you have at the very onset a variability of 15 feet, +/- on either side of your actual location. Not to say it WILL be 15 feet, (or in actuality 30 feet), but it can go that far. Next, is the actual "ping" that the watch does, when it received the GPS signal, is it direct from the GPS? Is it a "bounced" signal from buildings? Is it near water? All of these things affect the actual location that the watch thinks it's at. And, last, and this is the most important part, is what the device itself does with the signal. Some devices, (Apple is good at this) actually smooth out the signals, to make them appear smoother, while others, (Suunto Spartans, and Garmin for instance) leave the signals pretty much "raw" as they're received from the satellite, or building, or whatever. The "new" Suunto 9's, do have an algorithm that interpolates your position so it won't ping the satellite so often, thereby saving battery life, but that's another story. Also, there is what happens when the watch's "track" is interpreted by whatever map service you're using, I've seen way different tracks from MyGPSFiles, Google, Mapquest, etc, they all treat GPS tracks differently.
So, what's the bottom line? Save your money, buy what you want for other features, and understand that while your GPS track my "look" like a saw, that's because of what that little micro wave of information has given to the watch itself. Period. As long as you're within a few feet of where you actually were, you're good. There's may other things that are finite that can measure a watch's abilities, and the GPS Track is honestly the one with the most variability, depending on satellite availability, position of the watch, surroundings, tree cover, etc. More or less like trying to stack "BB"s"