The second one is a car sub in a custom box. As to how it will perform in HT, only god knows. Generally, using CAR drivers in HT isn't recommended.
First, you may want to do some homework on this. In particular, notice how much it is sold as new.
I suggest never paying more than 1/2 of the price of new for used HT stuff. If you look a bit harder, you may even find this subwoofer review on AH's main site.