Since their both about the same price which one would u choose? And yeeah i play hardrock/metal so therefore i selected these 2 models and their sexy as @#$%
personally i would get the viper. actives are more powerful and can give u the extra punch. u can get high output passives too, but u gotta swap out the stock pickups for the tempest. then there is the issue of 24frets vs 22frets. 24 fretters give u slightly better excess to the higher frets than 22 fretters. since u're gonna play metal and hard rock, chances are there will be some solo-ing on the higher frets. then again limited access can be overcome by constant practice till it doesn't bother u