Both are very dangerous.

Well, until Neal died, I didn't consider Rumpel evil at all but now.... for old times' sake, I'll say Zelena, but good question.

Hard question

Both

It's pretty close, because to the best of my knowledge at least Rumplestiltskin never raped somebody. But after what he did in the final episode, I can't forgive him for making Hook's sacrifice worthless.