Which was better in your opinion? I finally played Sphinx last night, and because it was just difficult enough, I would have to say that it out-POPed Prince of Persia: Sands of Time. The puzzles seem to make sense, and you don't die as much, even though the game was definitely inspired by Prince of Persia.
I haven't even gotten to the mummy yet, but Sphinx is an enjoyable character.
My only complain thus far with Sphinx is that the GameCube version requires 20 blocks on a memory card 59. WTF?