I dunno, I kinda thought this year might have been that (breakout) year for Chandler. I feel like his game is kind of stagnant, and can understand that people think he doesn't have a much higher ceiling. I'm not saying I believe that, but I can understand the argument.
I like Will a lot, like his defense and his demeanor, but he lacks something important, like creativity, or instinct or something. Gay is more skilled all-around, more dynamic on the offensive end.
That said it will come down to value for the money. I would want to snag Gay for a reasonable deal.