alpines generally sound "tighter" but the kickers generaly sound "warmer" in a broad sense but that can change with install/box/tuning and how well you do it. i have heard really nice (not loud) prothumps and even did a few graffitti sound systems back in the day that sounded pretty good but those subs were like 100-200 watts tops today we have 400+ watt cheaper subs that get twice as loud to our ears.personally i would look at the kicker site download the cvr manuals and see what would work best in that space and do the same with you other options then decide from that.