T400 or t800

I've only owned the T400, and I thought it sounded very good for a SS amp. That was almost a decade ago though. Recently I was looking at a T800, as a local gent was selling one, but the lowish input impedance sent me looking in another direction.

Thanks for the detailed answer Peter, I would have assumed the same as Mofi, that power was the only difference. You see, you just can't assume anything in this hobby! LOL!!

Cheers,
John