When it comes to "buying" an instructor's time, I want the best instructor with the most experience even if its cost me a bit more. If I have any doubts about his/her skill as a pilot or teacher I'm off to find a replacement. It's your money and your being taught skills that are directly related to your safety and that of your passengers. To do otherwise is just ridiculous. I'm not worried about the instructor's feelings being hurt as changing up instructors is very common. Ask any pilot how many instructors they had on their way to their PPC and more often that not it'll be more than one.