Pip, did you run a DA-20 into a wall and have it survive or what? The TB-9's took a huge beating...for what, 15-20 years?
I would instruct in a TB-9 over a DA-20 even if the Eclipse had 4 jet engines. I liked most of my students, but not enough to be overlapping shoulders with them for hours at a time. The Tampico wasnt fast, but boy was it comfortable!
But really, that's besides the point. I do agree with Pip that a (civilian) primary trainer is a primary trainer, no matter how many horses it has. With one MAJOR exception.
I strongly believe that there should be an instructor signoff required for IFR flight in a six-pack if you did your primary training on glass. Probably also the other way around, but I think that training in glass is way worse for a student pilot developing the basics than training in an LSA. God forbid your GPS goes out and you actually have to use pilotage and dead-reckoning.