Hand History

Villain is unknown
PF: value 3bet is standard.
F: not a great flop at all. I would decide to c/c and he checks back.
T: I think 9 is blank. imo, i should bet at this time to protect my hand. half-pot or little bit less than that is fine imo.

R: this is complicated. b/f or c/c? I doubt that weaker than pocket T would call.
however, I hate the situation when I decide to c/c but villain bet too big to call, so I should fold.
If I bet, i think I should bet small, about 1/4 is enough i guess. yeah it is blocking bet.
which option do you choose otr? b/f or c/c?