Which Subwoofer is better?

it all depends on what yo want and what kind of music you listen too. sealed and ported are just options of preference. A tighter harder hitting b is better found in a sealed box and louder lower b is found in a ported box. As far as speakers go, basically you get what you pay for. and the amp plays just as much of a crucial part in sound quality as the speaker does. Do some research and dont trust these guys that w/ no real information on your preferences say "X IS THE BEST BRAND" But JL, MTX, Kicker, Alpine, JBL and pioneer are all respected brands and are pretty hard to go wrong with. It's all preference