It's my understanding that Nauti's take a bunch of exposed/extra weight, just like Supra's do, to throw a competition wake for surfing.
Believe me, I can get a great wave with my 05' Supra using additional/exposed ballast weight, there's no doubt of that, I think I can produce one of the best inland surf waves in AZ when I want to.
What I'm looking for, and I'd assume the OP is looking for as well, is a boat that will throw a fantastic surf wake with entirely hidden ballast.
For that, I think Centurion and Tige have the lead.