I'd choose the the Scorpion, because it's got the machine guns as well as the main gun. It might be slower, but it has the advantage of having more fire power over the wraith.
The wraith is fast, but the mortar gun is klunky and awkward to aim over long distances.

One of my most memorable games involved 2 Flag CTF on Coagulation, Big Team Battle, when one of our team was having a base to base wraith battle with the other team. It was like something from a movie, dodging wraith shots as they came towards you in the warthog. We managed to take it to 2 - 2, then our team mate took out the other wraith [cross map I might add, it was impressive], and they hadn't got a chace.

[color=#666666]This message was edited by shanebyrne88 on Feb 27 2007.