Well my understand in if you are on campus and taking mininum credits, you can remain in F1 status on HOLD and get TPS with EAD benefits. However, if you have already completed your college credit course and in OPT, using TPS with EAD will terminate OPT for sure. If you want to come back to F1, you have re-instate your F1 status by applying again.
So do not just guess, consult with lawyer, college intl advisor and talk with USCIS. This is such a grey area and you have to be careful not to mess with OPT. As long as you are in OPT, never use TPS EAD.