Bounce is way more powerful than Ice Fang. Seriously, what exactly are you trying to hit with that 65 BP?
+1 252+ Atk Gyarados Ice Fang vs. 252 HP / 252+ Def Gliscor: 280-332 (79 - 93.7%) -- guaranteed 2HKO after Poison Heal
Look. It can't even OHKO Gliscor at +1
"The opponent can switch". Yeah, and then get hit by a +1 Waterfall, Seriously, what in OU can switch into Bounce without getting hit hard by Waterfall next turn, besides Rotom-W that takes nothing from Ice Fang anyway? Skarmory? It still takes up to 40% from Waterfall. There's also Mega-Aggron but that's so rare it's not even worth considering.
Also, Flying STAB is great this gen. Seriously, Bonce is just better than Ice Fang. Don't use Ice Fang on DD Gyarados.
Heh, I've never seen someone flip the shit for something like that. But either way, you made your point.