Some of the others seem to have had a relative ruthlessness baked into their founding DNA, and I wouldn't bet on them working out long-term. (Because leadership shapes lasting culture; and someone who's nice to you, but nasty to others, will eventually be nasty to you.) Also, for any duration at those places, I'd also need to vet whomever I'd be reporting to, for whether they'd have my back if/when daggers started flying around internally.

Another one seemed to have good founding DNA, but I know less about that one.