I use my F-91W for day trips or when I'm working (if it breaks while working on my car or choppng wood it's just 10 bucks).
Garmin Fenix 2 for hunting or overnighters. It's really practical to mark spots via GPS when you leave your game innawooods or tracking your path back to camp. I bought it used for 60.
I think they can both survive very cold temperatures. Since you wear them on your wrist it's not too critical.