I've had the RE type SE which i think are below the XXX, and they SE hit really hard. i had 2 15"
then i upgraded to 2 12" MTX 9500 which were probably double the power as the RE. Now i have 1 15" Memphis Mojo, and it hits almost as hard as my 9500s hit. and i competed against an orion hcca 15" sub with my MTXs and i blew them. SO I SAY, you go for the XXX with a nice amp to power it up and a nice big ported box, although it also depends on your trunk space, or you could go for a MOJO. They actually stopped making the orion hcca cuz they blow really easily. i woudn't get it but its up to you. I'm not gonna lie, the orion 15" hcca does hit really hard too. No matter what you get theyre all going to bump real good. You should just shop around and instead of confusing urself on which one u should get, just get which ever one you find more affordable.