Up: I think that that judofrac takes much more skill than judo. On judo, often on the first turn a part flies off and gets dqed. On judofrac it will just get fractured and you get more chances to win.
I think that aikido is a bit more skill than wushu. One reason is that there are more turns on aikido and you can plan what you are going to do, another is that on wushu the opener and second turn seems to matter much more than the rest of the match. I haven't played much wushu. I would probably have a different opinion if I played as much wushu as I played aikido.