Dayton Titanic 1200 vs SVS ISD for subwoofer

In a 85% Music/15% movies 2-channel system, which driver would be better for musical, deep bass? I want subsonic frequencies for what little movies I watch, but i must be musical and non-boomy for music. Enclosure will be designed around the driver, once it is chosen. I am just not sure which is better. SVS doesn't have any specs listed other than those you can derive from perofmance curves of their subs. The specs for the Dayton are nice... Which do you guys think is better? Thanks