Bogut = past his prime and injury prone. Asik = entering his prime and reliable as heck. No question about it.
If only he would've found his inner gymnast it could've been... <iframe width="420" height="315" src="//www.youtube.com/embed/kspB8upM8rc" frameborder="0" allowfullscreen></iframe> instead of <iframe width="420" height="315" src="//www.youtube.com/embed/-M-g5wZ5js4" frameborder="0" allowfullscreen></iframe>
Bogut healthy is easily the better player. Bogut is rarely healthy and paid more. It's a tough choice. Bogut raises the ceiling of a team that Asik hasn't shown the ability to. But Asik has never had any injury concerns as a center and is on a better contract. Asik would have to be the right choice for me.
I'd rather see Rox get Varejao for Asik. Varejao would be an interesting complement to the frontline.