I like both T80 and T19. They play differently. T80 is deadish on very passive shots (a very good property) and deadly when going active; a good short game, and very aggressive active blocks and counters. It also counterspins well, with a relatively flat curve, landing quality shots deep on the table. It's fun in direct play (counters, smashes).
T19 has a quite passable short game. It spins up backspin a bit easier and safer (for me), with easier net clearance and a more pronounced dip. I have a high sense of reliability with it, with less flash and bang than the other tenergies. Of the two, for me T19 is the more versatile one and I like it a lot.
But I like Fastarc-G1 even better.