Cvr's will have a flatter frequancy response, the RE's will have better SQ and be louder if you have a good box but will have peaks in the frequancy response
Ive never used the kickers, but i can say the SE's get loud,low,and sound very nice doing it. Im only running 1 atm off 400rms in a crap ported box and its very impressive, hits hard and shakes the piss outa my truck