If we get Love and another starting caliber center then I think KO is the choice. I get the feeling that Sullinger needs to start where KO could be a great third big or starter. It may sound like I think that Sullinger is better because he 'needs' to start, but I honestly think they are pretty comparable (but have a different skillset).
I don't know, maybe it just seems that KO would be more upbeat about his role where Sullinger might already have one foot out the door...obviously pure speculation, though, and I [of course] would love to keep both of them.