I can't help you much, not having played through all of the amps, or even most of them. A 1G T is excellent for bass. I didn't care much for my 2G T until I modified it to sound more like a 1G. I have no idea how the Fender-era Model T would sound for bass. It's a dedicated guitar amp, but lots of guitar amps sound good for bass.
Both the 300T and the 1200S have more power than the Sunn Model T's. I'd say go with the 1200S if power is a consideration. I don't know about price. As for sound, that's a personal thing. Some will say that the Sunn T is the holy grail, but you might prefer any one of the three. I like my T, my 200S and my Sceptre (guitar amp) for bass. They're all different, and they all sound good.