Zwift, I find the draft is measly unless it is an event does the "full draft" option. I wish Zwift would enable draft for TT bikes for only TTT races. That'd be freaking cool. You have to TTT right now in road bikes, otherwise no draft.
I've done two TTT for Team Type 1 in the WRTL series stuff. Not for a while though, it usually wrecks my week to do 40min bouncing it off the limiter.