900 cc Triple, all carburetted. The TBS IMNSHO is the more desirable.
I Have an 02 Tbird with 50,000 klms on it, nary a problem with it. The seats are hard and uncomfortable, I just had mine restuffed. Early model had starter clutch problems.
They sere discontinued because they were not selling well. Triumph says they were discontinued because the tooling was worn out and that the model had run its course anyway. The red ones go faster. Not mush else to add except the TBS has 17inch wheels, much easier to get tyres for. And they aremore comfortable, with a few more ponies than the stock TB.
Heres some pictures of mine.
Jims TBird