I'm leaning towards the 1210... OK, who am I kidding, I already bought it
To my ear, it's got the best balance between thump and growl. The 1212 was more thump and the 12+ was more growl. I like to feel the bass, but I also like it to cut through the mix. So I'm a 1210 guy for the forseeable future.
Dont get me wrong, they're all very nice. For fretless, I probably would've gone with the 1212. If I had old man syndrome w/ a bad back, I'd have taken the 12+.
Jorg promises that all of his cabinets open up in the low end after a 2-3 week break in period... if that's true with the 1210, I'm going to be ecstatic.