Anyone posting Zidane should be banned. He did his best to throw that game last night with his subs, and hes only been in the job for 5 months. Also, surely no team has had an easier path to the final, and while I respect them for somehow winning, they had a large slice of luck. Other fans refer to Istanbul as a lucky win, but really Real had a lot more luck last night.
For me it depends on circumstances. The only manager in the world I would consider trading for Klopp at Liverpool is Simeone. For the vast majority of top-half clubs in the big leagues I consider those two the best. Emery, Wenger and Pochettino are similar but not quite as good IMO.
But if you are a club that can afford to spend Ł100m+ net every year (City, Madrid, Barca, PSG, Utd, Chelsea) then I would say Mourinho, Guardiola and Ancelotti are the clear best. They all have a track record of going to the big clubs and winning thing but none of them have built anything from scratch.
Unless I forgot someone, I can't think of anyone else that merits discussion.