I've never been to a huge convention x.x So all I know is that az is small enough to be comfy, but big enough not to get boring.
The dealers room never seems to have a line other than the 20 minutes right before it opens... so thats good...
AZ usually runs out of hotel rooms for the sheraton around the beginning of April. I get my hotel room in february, but then again AZ is the only con i go to. ^^;