Loudness doesnt matter if they sound like shit, i'd go quality over quantity any day. What brand are the BAZOOKA (you spelled that wrong...) tubes gonna be? it all really depends what you want. If you want quality i'd go with the jbl since i have no idea of the bazooka tube brands, if you want a loud ass system that that doesnt hit the different notes as well go with the no name bazooka tubes.
And heres another great idea, 2 15s and 2 bazooka's ?