Loon, you do know that the T-34's have the fastest turret travers in the game?
And it depends on if they have the base defended or are just barely holding and trying to get an M3 to the map room before they get kicked off the base. In the first case, you will want the Tiger, especially if they have a firefly or a Tiger of their own.
You would usually be correct though, that the M8 and T-34 would be the better choice though, as they rarely think of anything past camping the hanger, and guarding from the base.