Personally I would be a teagle (a mix between a turtle and eagle, I made it up in art class, don't hate). Why you may ask? Because it is simply the most majestic and kick-ass animal ever!
psssh as if I had to think. Pony. Real men love ponies. I would go off in all sorts of adventures with all my friends in equestra and share the magic of freindship and sing. And fly 300mph.