Well i would go for BSW but i was at a stereo shop getting my subs installed, i just got a 12 inch in a nice box, very great job at Garner's Stereo in Asheville NC.

Well anyways, JL spends a couple months developing a system for a specific car, they spend about 60,000$ on just one car testing different combinations and stuff for different cars.

I would assume that BSW only deals with One brand mainly and JL with many car brands. and that BSW would be better....but 8" seems a little too small...