If you're going to apply heavy weathering, you'd best go with anything German--ie, the Panther. There was just a thread here recently about how tough the Allies' paint supposedly was, and how it didn't get too banged up-looking.
It also depends though on what you would prefer to model--are you more of a "German" guy, or an "Allied" modeler? Each genre has its own specific color palettes and techniques that work better on that genre, and if you're going to model one type more so than the other, that should figure into the decision.