Have not heard either, but thought I would chime in.
If this was for HT, I would go for 12" minimum.
But, since this is for 2 ch music, I would lean to a 10" sub.
The 12" would give more impact for movies, but the 10" should be faster (less mass to move), which would be preferably for music. Drawback is that it will not go as loud. But I am not a bass head either, I have been happy using monitors with no sub. So, it depends on your preferences and how loud you listen. The ideal setup might be two 10" subs.
Randy