This app was mentioned in 2 comments, with an average of 1.00 upvote
I use this app succinctly named "Ski Tracker" on my Pixel 2 XL. It's not a smartwatch app but it's powered by GPS so it still works when you don't have service. I haven't compared against other apps but it's the highest rated tracker I can find on play store and it consistently tracked all of my runs last season. Only real con I can think of is that if you start at the base of the mountain and ride a lift all the way to the top, and then grab another lift partway down the mountain, it will count those multiple runs as one run which can skew your stats a little.
I'm using Ski Tracker, it's pretty good; it tracks speed (max and average), altitude, slope, distance. Usually ski apps work really well. Don't know about Android Wear compatibility though, sorry.