I'm not up on my cinema equipment knowledge, but does anyone know (or is it common knowledge to everyone else) if there are better 3D theaters than others? Is the 3D equipment used a standard, or are there variations (read IMAX and "Fake" IMAX)?
Gary's breakdown on the last page does a good job of detailing some of the differences in formats and quality. What I would add to that is once you get down to theaters which use single 2K projectors, there are three common formats: RealD, Dolby, and Master Image. Each has its pros and cons.
RealD is probably the most common. It uses circular polarization, but the polarizer is not as good as the others and causes excessive amounts of ghosting. So a specially processed version of the movie needs to be used which eliminates the ghosting. Unfortunately, it also reduces contrast.
Master Image uses the same type of polarization as RealD, but it does it much better, so none of that processing is required.
Dolby separates the eyes by filtering out different color wavelengths or something like that. I don't really understand the process and just chalk it up to magic, but the end result is that you don't need a silver screen. That's good, because then you have an even level of brightness without hotspots. The downside is that the inside of the lenses on the glasses are sort of mirrored. So if there's a light on in the back of the theater, you can sometimes see it out of the corner of your eye. Also, I've been told by people who wear glasses that if you don't have the Dolby glasses positioned quite right over your real glasses, the reflection creates a double image. Some people have trouble with this and some people don't.
I've seen all three, and there's not much difference between them. Given the option, I'd go with Master Image. But there are enough other factors in determining a theater that this one would not weigh heavily on my decision.
p.s. I'm by no means an expert on this stuff, and it's quite possible that some of my facts are wrong. So if anyone has a better understanding of these things, feel free to correct me.