100 BB stacks. Villain is a very aggro tough reg. 6 handed.

2 folds Villain opens CO to 3x(RFI 40%, 4bet 7%, F3b 15%), Hero 3bets Jc8cAh5h from BTN to 10.5x , SB folds, BB folds, CO calls

Flop KdJs8s(22.5) Eff Stacks 89.5bb

CO checks, Hero?

Or

3 folds, Villain opens btn(RFI 90%, 4bet 7%, F3b 7%) to 2.5x, Hero 3bets Jc8cAh5h SB 8.5bb, BB folds, Villain calls.

Flop KdJs8s(18bb) Eff stacks 91.5bb

Hero?

What is the best way to be thinking about these two spots, aside from the
fact that in the CO v BTN hand we're facing a narrower of a range than
in BTN v SB? Do you think they're both bets or both checks or is one
different than the other? If so, why?