[Chris Fultz]

You will see a difference in pushing performance due to the traction capabilities of the wheels used, not so much the power available.

The mecanums are usually a hard roller material, which will not provide much "grip" into the carpeted surfaces. Assuming the 6WD is using some sort of treaded wheel it will have more traction onthe carpet.

Think about walking across the playing field in your slick soled dress shoes. You can move, you can run, but you can also push your foot out to the side and it will slide across the carpet. In a pair of softer soled athletic shoes, you can also move and run, but if you try to push your foot out to the side it will take more force to do so.

The mecanum is like the dress shoe, the treaded wheel is like the athletic shoe.