[Max Boord]

Originally Posted by Kevin Sheridan

I would even argue that mechanically there is a pretty big difference too. The tolerances are a lot tighter when machining and assembling the frame for mecanum, otherwise you could end up with only 3 wheels on the ground and a really bad drivetrain. 6WD tank is much more forgiving in regards to bad machining.

My team has run varying degrees of "floppiness" and pretty conclusively showed a rock solid chasis with properly tuned PID loops preforms about the same or worse than a floppy frame running the default WPI holonomic code. The difference also increases as the robot goes through more and more events.

EDIT:
CG has far more of an effect than frame rigidity. Even 2 metal pneumatic tanks on one side caused strafing to deteriorate noticeably.