OP is good, just different. If you use a concentrator, you can get your oxy costs down, otherwise propane is far more oxy greedy, I think something like 6 times. So that part does get spendy. You can weld with OP, so certainly brazing is no problem. If you are used to something else, you would probably have to play with some stuff, but there is a wide world of options out there, just treat it as OP, and don't run your normal process then be surprised if it doesn't work.

Big advantage gas wise is that you get to use a far less dangerous gas than A, which is really an industrial setting type of gas. Many people's vehicles, at least around here, won't even safely/legally transport A. A is like that show 1001 ways to die. Particularly for folks who are not going to get training, OP is less risky. And it is acceptable in a domestic setting. Of course your local rules can be hugely different. OP is also cleaner burning, both for the work, and for the workspace. If I was a pro working in a pro shop space, I would use OA, but as a hobbyist, I have no interest. Mostly I would use OA for the welding, and for the oxy consumption, not anything to do with results.