IMHO X-men. It has a great mix of shots (some tight, some easy). The multi-balls are pretty decent. It has a great bash toy and a physical ball lock up the middle. Nice combo shot with the upper left ramp. It has decent flow and the randomness of magnet(s). Amazing artwork.
While I quite like 90's Bally/Williams games I never found any love for Ruddy. I much preferred Red-n-Ted in RoadShow. I find the gameplay in FunHouse to be very dated and not fun. I find it get's old fast.
I don't mind the voices in X-men. (Yes Beast & Phoenix are not very good but they just disappear into the game. But then again the hillbilly music in FT, the country music in RS and the red-neck voices in BBH don't bother me either.)
I know some people really love FunHouse but I am not one of them. However, I am one of the folks that thinks X-men is way under-rated (as a result of the awful early code and bad first impressions - such a shame). IMHO, X_Men has more staying power in a home use environment.
Good luck with your choice.