x2Consider what you want out of the system. SE's tend to be more SQ oriented, SX's tend to be more oriented towards output. This is not to say one cannot be loud, or the other sound good, but you are asking for a comparison of the two.
Second, consider the power differences. Which fits you and your system best? Once you address these two points, you will have your answer.
no they arent going under the seats. the box will start in the area between the center console and the backseat and go up and over the middle of the back seat. same concept as this video but minus the amp rack, and it will be fiberglass:Do you plan on putting the box under the seat in the ram? You'll be limited to around 1 cube per sub after fiberglassing, there may be other subs that better suit your needs, look at the IDQV3