the type rs are just better subs...sound better, get louder....type-s's arent bad at all. i have some, and for 65 bucks a piece it doesnt get much better...
The Type R does awesome in a small enclosure ported. I have one of the loudest systems in town with just one 12 Alpine Type R. Its only in a 1.33 internal Cu Ft box tuned to 33 Hz and it slams. Type R's are comparable to JL 12W3v2's while type S's are just a little lower. I heard Type S's were more for SPL than SQ but I'm not sure if that has any truth to them. I've never heard the Type S's but the Type R's are awesome.