Wow -- that's a hard one! Of course, some of what works is who you like and get along with.
If I were training in Europe, I'd probably go to JP Bresser. I had the great good fortune of getting a small photo seminar from JP a couple of years ago, and I was very impressed with him as a teacher -- organized, clear, efficient, and very thoughtful.
In Florida, I'd go to Mark Messersmith. Mark is just a wonderful human being, and very much into TEACHING, as opposed to evaluation.
In Mexico, all three guys are good, and it's really down to whose style you like best. Fred's the most laid back and, I think, the most tolerant. Danny's a fantastic teacher (he was my C1 instructor) and his attention to detail is sometimes almost infuriating, but it's one of those things you look back on later and realize was SO useful. I haven't spent a lot of time with Chris, but a friend of mine took her C1 from him, and really liked him.
It's nice to have so many gems to choose from.