The JBL is a better box simply because it can make you more money and its lighter, which makes you even more money saving on fuel costs. RCF and other off-brands are really for hobbyists, which is fine if you never intend to do anything interesting with your business. It might sound "better", if you define better as: "I already bought it, so even if it does suck and everyone else in the world hates it, I still must like it because I can't return these off brand speakers and I have to convince myself that I made a good buy" For the record, every speaker that RCF has ever made is wimpy and cheap compared to name brand speakers. I have heard many of them in real life and invariably the reason for purchasing them was, "well, I got a good price on them..."
good luck.