Andre, you may have already pulled the trigger, but I would recommend the Aperion for the following reasons:
1. Aperion builds speakers and subs only. Outlaw builds components and is now getting into the sub/speaker market.
2. Although I haven't heard the Outlaw sub you mention, the S8-APR sounds great and is highly recommendable!
That said, you could bring both home and audition each in your system with Aperion's and Outlaw's in-home trial periods.