Ok, here is a little secret: rarely is a rebreather of any additional value really, but you won't hear that from CCR divers. Instead you will get scripted hucksterisms about how you can get up close to marine life, buoyancy is easier, it is all safer, and a host of other whoppers.

If you're doing tech diving for a reason, then they really come into their own, otherwise, they are a logistical issue for travel. I almost always dive closed circuit and almost always dive with open circuit friends. It's just something cool to do.