I've got a GS412 and a GS410 that I use with the DB750 (each on there own of course

)
The 12's go out the door more
Both good cabs, the tens are tight and punchy whereas you already know what the 12's are like

HUGE bottom, warm and fat with plenty of growl.
Depends what I'm playing bass wise and what the desired "lean" is for any particular gig?
You can't go wrong with either IMHO... depends what YOU like? (I used to use a single GS212-4 cab for your comparison etc. which is similar to the 2 x 112's you're using) and compared to the GS410-4 the above applies pretty much equally (the punchy vs. fat comparison)