it depends more on the setup than just what sub woofer. what amp are you running? is it true Watts or a overrated amp? how many woofers you running, how loud and how good it will sound depends alot on the box. you cant compare the two in the same enclosure each woofer will do better in a box suited for it. i have heard all the re's and owned the re series and mt's. they are very nice woofers. but the dd will handle more and take more abuse than those sx's.
i did a drop in test in a cavalier with an audioque hdc3 and a re sx both 12's using a kicker zx1500.1 and the aq murdered that sx in every way possible not even a comparison . but than again the aqhdc3 is a Chinese version of the dd 9500 check the link below
http://www.audioque.com/aq/HDCSeries.htm