I have an ESW-C8, it is a good sub, given the small size. I'm sure the 10 is better.
However, if size is not a major constraint, this is all-around a more competent sub - it will play louder and deeper, and is just an excellent package of sub goodness for $138 shipped!
It is not big, by any means, but the SUB-1200 is 16-3/4" H x 16-3/16" W x 17-3/4" D; 44 pounds
and the ESW-C10 is 14.8 x 13 x 17 inches ; 28 pounds
and ESW-C8 is 12.3 x 10.5 x 12.7 inches ; 16 pounds