I don't often feed crowds, so for myself I use a couple of 9" dark pans, one of which has sloping sides and the other of which has straight sides. The straight-sided one is a springform pan with a removable bottom which, of course, makes depanning a breeze. Neither of the pans is a pizzatools pan, only something I picked up on sale somewhere. I use a pan gripper and a flexible spatula to remove deep-dish pies from the pan with the sloping sides. I think the sloping sides help with this process.
I also have a 12" pizzatools dark deep-dish pan with straight sides, 2" deep, but have not tried it yet. I thought that would be a good size to use when feeding more people. Since I haven't actually used the pan yet, I can't comment on the ease of removing pies, but I would think that the equivalent pan with the sloping sides should make for easier removal.