Who's the best pro... depends on what you consider.
If you take raw ski talent then its guys like Pep, Pollard, Cr, Sage.
If you take pro to mean more than just the  skiing, if you consider the promotion and growth of our sport, then its guys like Tanner, CR and Seth.
If you take everything into it, Tanner is the best, as much as I think he needs to pull up his pants and learn to ski pow, he is the best park rider ever, he promotes the sport more than anyone.  Should Super-pipe ever make the olympics, our boy Tanner will be to thank.  Should it ever become Main-stream it will be Tanner again.  He gives skiing an image, and he gives it progression.  He is all by himself at the top of the pro world.