Biggest difference maker here is the speed. Alpha 1 will definitely be the faster ski, since it has the race base. Both, as you probably know, slay rails, and Alpha 1 will do better on jumps, although if you're staying around 50ft you would probably be fine with Halos, not possitive though on sketchy landings. Other than that your pretty big so you might prefer the stiffer Alpha 1s, don't think it will make that much of a difference though.
If you can, demo, but I would say definitely Alpha 1's.