Basically the same cost once you figure shipping. So...which one is better or is just getting down to preference at this point with neither being a mistake?
The SVS will play lower. A LOT lower. The 2 subs are pretty much equal when the SVS is in 20hz mode. Move it to 15h or 10hz mode and you will reach down deep. A 12" vs a true 13" driver, the 13 has more surface area. Since it was designed by one of the best transducer engineers, it will have a decent amount of excursion. Finally, the 13" driver of the SVS is underhung for the best possible sound quality.