My friends and I recently got into a debate about Aggron versus Tyranitar. We reached the consensus that as rock/steel and rock/dark tyrannosaurs, they were meant to be rivals.
I vote Tyrannitar. Higher base stats, plus a larger moveset. It's pseudo-legendary and pseudo-dragon. Its rock is weak against Aggron's steel, but it's attack and speed are higher so if it knows Fire Blast then it has a definite edge.
In fact, as one of my friends said, the only thing spectacular about Aggron is its defense stats.
It's split pretty evenly among us.
So which do you think is better? Aggron or Tyranitar?