I flew with four instructors during my PPL, three of them in the first ten hours! The first was very good, an excellent pilot and a good instructor to boot. Used to hit me and swear at me occasionally, but I'm big enough and ugly enough to handle it. Second guy was borderline dangerous (now retired), third guy was dead keen but lacked experience. Fourth guy was a girl, good pilot, good instructor and light enough not to affect the performance of a C152
Did most of my PPL with guy #1. Post-PPL I've flown with three instructors for various purposes.
Seven instructors in total, more than I realised. If I had to nominate the best it would be difficult to choose between two of them. They're both PPRuNers, so I wouldn't want to embarrass them ....
