1. what sub? 2. what do you want, loudness, or purer, cleaner sound? 3. how many subs? 4. how much space do you have? 5. suv or trunk car? 6. its really a personal thing
and by the way, please read on the forum before you post questions that have been asked probably 14000 times and answered twice that many times. believe it or not, you can learn a lot by reading.
I'm glad you don't own a store...you're customer service skills need help.
Yeh, doing a forum search will turn up a bunch of good info...as for which is better, as stated above, it would depend on what you are trying to accomplish. Please rephrase the question.