First real post!
I don't know how helpful this post be, but I used the Whistler/Blackcomb specific app, and it was pretty awesome: tracked speed, runs, distance, etc. using GPS. It was a bit of a battery drain, but the app ran without the need of cellular service or data, and I had all data turned off, (since I was out of the country), and I feel like it helped a lot with battery life. Being out on the mountain, service was pretty bad so I also turned all cellular service off at times, which saved battery life because searching for a signal really
killed my battery. I ran it most of the day on the mountain, ~5 hours, and still had battery left over by the end of the day, using an iPhone 5.
The Ski Tracks app on the iPhone looks pretty decent - tracks speed, distance, etc. I don't know if you've tried it and had the battery drain or other problems, but it claims to run without the need of data/cell service, so it might be worth a shot! I think I might try and use it as well this season on my new 5s.