I have 2 rebounders - a Cellerciser and a Bellicon 44". I love them both in a little bit different ways. Overall, my favorite is the Bellicon for a few reasons, but I also like some aspects of the Cellerciser a lot more:
The Bellicon is super quiet - like the only noise at all is just your own body weight, the rebounder itself is silent, which is nice.
The Cellerciser advertises as being super quiet, but after not too long, it gets squeaky. I've heard a bit of WD40 or a bit of oil will take the squeaks away, but I haven't gone to the trouble to try that.
The Cellerciser has less bounce, but still feels good - I had a really old trampoline from the 80s and that one actually hurt my knees and back to jump on. Hated it. The Cellerciser is good (for me at least) for really fast movements.
The Bellicon has a lot more bounce and so has a bigger fun factor. I have to be a little more careful of making sure I don't pronate or supinate my feet, though, because of that.
I got the 44" Bellicon model that the legs fold, and then you can "roll" it on its side - very handy.
My Cellerciser is a tri-fold, but I honestly have not even folded it once because a) I haven't had to, and b) I'm pretty sure it might be a two-person job (maybe not), and I have the bar attached, so I'd have to undo that and it would be a big hassle. So the Cellerciser can fold up smaller (and even has a wheeled case for it) than the Bellicon, but I've found the Bellicon super easy to fold/unfold the legs to have it be upright against a wall or out of the way a bit.
The Cellericser is black.
The Bellicon I got in black with sliver mat and silver bungees (because I just couldn't choose), and in the future, I can get another set of bungees in a different color to change up the look.
The Cellerciser came with a few extra springs, but I haven't needed them.
The Bellicon you have to replace the bungees when they wear out. Since I have two rebounders, I don't use the Bellicon exclusively (I would say I use them about half and half or maybe a tiny bit more Cellerciser just because of where it is in my house right now). So that was a drawback, seeing as they were like $75-80 for a new set when I had checked awhile ago. But the good news is I've had my Bellicon for almost 3 years now and I have wear on the bungees, but none have snapped yet (tip - after you see a bit of wear on them, rotate them so they can gradually wear out instead of wearing through just one section of the bungee if that makes sense).
Price is definitely a big difference. I think if you're wanting the largest area and the highest bounce, out of the Cellerciser and the Bellicon, the Bellicon would be the one to get. But I also really do love my Cellerciser - the fun factor isn't quite as high, but somehow I am still really drawn to use it on a daily basis and I do feel more stable on it). So I really think you can't go wrong. If I had to get rid of one of them, I wouldn't know which one to pick.
Hope that helps