I also will recommend T-1275's for some people, based upon space constraints. Besides BFL13's positive opinion of the T-1275's - I have a buddy with a Grand Banks that have a bank of these as his house batteries, (With watering system on, makes maintenance pretty dang easy!).
One thing I'm not clear on, is how long have they been available? I don't recall reading about these too far back? Is it a newer Trojan Deep Cycle offering?
It's always about space, desired total AH's, need for faster recharge - or not, and of course - budget!
Best to all,
Smitty