*I'm not a fighter either* Greg Jackson I think is still a great coach. I didn't like how he was getting so much love around here during his heyay, but I don't think you can deny he's a good one. Even if he wasn't, he has so much experience coaching at the highest level, if you can spend time with him, why not take that? Especially if it's the more convenient option.
You can always change teams if it doesn't work out. I think Pico used to train there too, no? I think he might have switched camps though now, not sure.
I'm not sure about Wink, it sounded to me Jones had beef with Wink, not sure if it had any merit in that. Jones doesn't come off like a good person, but might not hurt to research more about Wink.
Greg Jackson on the other hand, I don't think you hear anything bad about, other than maybe he was a bit opportunistic picking GSP over Diego, and Jones over Rasahd.