Ive ran both. Both in the 15 and 12 inch sizes. Youll be happy with the EVIL. Its no joke. The Evil has WAY more motor force than the SP4 v1 and v2. Great driver, both are, but youll really like the evil. The EVIL 12 with a legit 10" spider, sexy Ti basket (my favorite basket), big, bullet proof 4'' coil,... ya dude, not many on the planet with love like that. Youll dig. I just played around with some 12" EVILS, and SP4 v1's, (identical to the v2 T/S wise) and then ran 2 12" team fi 12's for a season in a trunk build. All on a Ampere Audio TFHE 9.0.
Both the evil and team where my favorite 12 ive ever ran. And ive ran a couple, from old school to these.
I didnt get much play time with the evil (or sp4) but, trust me, its a fine fine driver. Youll dig. Keep us up to date on progress.