For
@Mas. ...
It doesn't matter which rebreather you dive; it only matters that you know how to dive it and put in the effort to maintain and prepare the unit.
I'd add that having CE approval means that it's had a lot of development work completed and that it meets the required standards.
Selecting a rebreather is easy. Put together a short list of three. If there's more, then it's a long list that needs whittling down to three.
Then you choose the one you always wanted. For me that was a Revo. For many many others that is a JJ, or whatever else they've chosen. Nobody cares as it's literally your problem to deal with.
FYI my shortlist for my first rebreather was Revo, JJ, X-box.
I chose the Revo as it has a double scrubber, uses less sodalime than others, fully redundant electronics (3+2 cells feeding two computers), it had few moving loop components (no T-pieces), has both an orifice and solenoid, needs few specialist tools for maintenance, has armoured counterlungs, uses Searwater electronics (a must-have for me), and all Revo divers seem to like them.
The JJ would be the no-brainer, even GUE have chosen to take a JJ and mutilate it.
The X-CCR was a bit too complex for me with the radial scrubber.
The long list also included:
Sidewinder (inappropriate for a first rebreather primarily for sea diving);
AP Inspiration (too much plastic and I hate the yellow box, but definitely don't want proprietary controllers);
Excluded was the Poseidon, Redbare, SF2, all sidemount rebreathers, and chestmount rebreathers (although this market has changed enormously in the last 5 years)