Pinnacle Blk Diamond Supersonic vs HSU & SVS??

I've been looking at the SVS brand subs along with the HSU VTR3 MK3 and stumbled across a Pinnacle Black Diamond Subsonic sub. Are any of these subs significantly different ie better than the others?? Is Pinnacle a better sub than any of the HSU or SVS subs? Anyone with experience with the Pinnacle?? Would love to hear from owners of any of the three.