Honestly, there really isn't. Granted, I haven't played a TON of various brands, but have played and owned a couple of the major brands. I guess the only one that, to me, comes remotely close would be a Musicman....but I still wasn't vary inspired by it and probably wouldn't even considerate it a second, third, or even fourth place.
It's definitely a personal thing, but I just haven't come across another guitar that consistently provides me with the feel, tone, reliability and play-ability that my PRS guitars do.
Having said that, I've never played a Jackson, Suhr, or Carvin - those seem to get a lot of praise from people. But I'm the kind of guy that, if something works, I stick to it - so chances are I won't be playing any of them any time soon.