So both have been regarded by some as having the Perfect Ass, or maybe Perfect Culo. Vida, by FHM, and Keyra by Howard Stern among others.
Personally. I don't care much for Vida - not sure I would even vote it a nice ass, never mind perfect. Keyra, it's hard to tell. In some pics I'd say it was great, in some others not so much.
Overall Keyra for me is the better of the two, but both fall short of perfect. Wouldn't even make Rear of the Week for me.
Keyra
Vida