Velodyne dd series 10 or 12 v. Rel Strata III

Has anybody compared these two subs? How musical are each? How fast compared to each other. They would be for use in a two channel system with BV Audio A300s, arcam 23T cd player and totem forests (although forests may be changed out). Room is fairly large 24x16 with marble floors and 23 ft ceilings.

Thanks.