I went for a lusso over the TI mainly because of the fact I wanted a red interior. The seats are a bit nicer in the TI although not by that much since the 08 revisions to the lusso seats but the steering wheel is a lot better. The thing I miss most about the TI is probably the suspension to be honest. The 19" wheels are nice but not that Alfa like and I would have the Brera S wheels over them.
Nice to have the choice and maybe given my time again maybe I'd have the TI but I have a nice high spec Lusso with some decent mods and it's a nice car. I think the lack of Blue and Me is a glaring ommision from the TI spec although it's not that expensive to add.
It would be nice if you could pick elements of all the range to add extra individuality. A TI with red seats and Brera S wheels would be my idea of a dream spec. Many 09 and after cars seem to be TI spec so I expect that specification is proving attractive to many company car drivers who might not be past Alfa drivers. One chap (very friendly) approached me in a car park and asked about my horseshoe wheels and red interior as he thought they could only come with a black interior and spoked wheels.