Both subs you mention are tremendous performers - probably overkill for the vast majority of 2 channel applications. I really doubt that you'd hear much difference. You won't go wrong either way...provided that you get them well integrated with your mains and that your room can handle the output. I use a Velodyne SMS-1 sub controller to help integration. It's reasonably priced and it works like a charm.
BTW, I haven't heard the SVS that Knownothing recommends, but they have a great rep and test off the charts. They offer in-home trial, and if listening bears out the specs, these subs would appear to be hard to beat for the money.
BTW, I haven't heard the SVS that Knownothing recommends, but they have a great rep and test off the charts. They offer in-home trial, and if listening bears out the specs, these subs would appear to be hard to beat for the money.