Both sets of subs are rated @ 600w RMS, but the SA-12s are gonna take more abuse. The Type R 12s will take about 800-900w of clean power. Some people do more, but that's what I'd call safe. The SA-12s will take a little more per sub, but you'll need more overall power for 4 Type Rs than 3 SAs. Personally, I'd go with the SAs, but that's just me. Their performance will be totally enclosure dependant.