I think the Infinity's have better sq than the type r's.
But there are better sounding subs than alpine and infinity's.
I have the Elemental Design 10k.14 and love them.
Check them out here: http://www.edesignaudio.com/ep/kseries.htm
Or you can also get the adire shiva's, i heard they really sound great but needs a big box though.