I will start off by saying that I dive the DUI CLX450. I looked at the other suits and there were a few things I noticed that might be of interest.
The Diverite suit has the zipper across the back, which is harder to get in and out of as opposed to the diagonal front zipper of the CLX450 and the Bare. I do know people who can get out of it on their own, but it is more difficult for "most" people. One counter arguement to front zippers is that the front zippers are longer and thus have more chance of a portion of the zipper going bad.
Another issue is the wrist and neck seals. DUI offers the Zipseals, which I have found to be very useful. There is nothing worse than getting ready to dive and then tearing a seal, especially on a liveaboard. You can replace the seals in a matter of minutes and are ready to dive. However, others would argue that this is a potential failure point as there are no redundancies. If the seal fails, the suit will flood. I have yet to actually hear of this happening to someone, but there is a potential there.
The diverite has attached booties as oppossed to the socks on the Bare and CLX450. I personally dont like attached booties, because of the floaty feet effect. There are ways to counter this with gaiters, but you will still get more air trapped in them than the others. Two advantages to having detached booties is that you can change them as needed and they can be laced tight to prevent too much air from getting trapped.
The CLX450 is also equipped with the warm neck collar. This allows you to tuck a regular hood bib under the cordura overlay on top of the latex seal. I have found that this keeps my neck quite warm on <40f dives.
The ability to give as you move provides better comfort. The CLX450 uses the telescoping torso and the Bare uses the Automatic Torso Recoil. This is a great feature for added comfort, because it allows for a greater range of movement when bending down and a more tailored fit.
However, there is also a marked difference in price among these suits. The Diverite and Bare can be found for around $1300, the CLX450 starts at around $1800 and that is without accessories like pockets, which the diverite comes with by default.
Good Luck!!! It's a great investment.