I own and completed both versions.  I like the PC version more because I think the unlockable characters are more fun and the leaderboards seem to be in better shape.  Also, can't wait for that level editor.

I actually bought a Fight pad specifically for this game.  Before that I actually ruined the X Button on a 360 controller from pressing so hard on the run button 24/7.  My Arcade stick also worked really well but had a learning curve to it.

I bought it for about 8 people during the steam sale; my steam group started calling me "Satan Clause" as a result.  Before that I convinced 2 or 3 people to play the 360 version.