AJ Tudor
Registered
I have an XTX50 and although I only took it diving once so far, I have to say it breathes beautifully. Gives you plenty of air without throwing it down your throat. Saying that I believe the ATX also breathes the same. As others have said you probably won't switch from left to right configuration, but it's always nice to have the option. The same goes for the exhaust. I favour the wider tee because it keeps your vision clear, but I like having the option of changing it. In short, they're pretty much the same reg, you just have more accessories on the XTX50. I'd say wait for the XTX50.