Depends on when the fight takes place. Molly trained earlier and was a wrestler for her whole run. Trish started as a valet, but when she had reached a certain level of experience she became arguably the best diva on the roster. I'd say that if the match took place in the first half of so of Trish's career Molly would have the edge, but if it was nearer to the end of Trish's run the smart money would be on her.
If you're looking at it as present day I'd say Trish has the edge (ignoring her pregnancy, that is).
-JM