Mastercraft shits all over Nautique. There's a reason X-Stars are used in the PWT and the X-Games, not to mention the majority of the crazy new tricks being thrown these days have been landed first behind Mastercrafts. I've ridden behind X-Stars, SANTEs, and Malibus, and the MC delivers the cleanest, most consistent wake with just the right amount of pop and ramp.
My every day ride is a 2002 X Star with stock ballast tanks filled and a fat sac in each rear locker. 75 feet at 23mph. It's god like.