I'd just be honest. At the end of the day, it's your money and you don't just want to throw it away flying with an instructor who you don't learn anything from.
when you book your lessons, try to find if other instructors are free and book a slot with them. Once you find an instructor you get on with, stick with it and see how it goes.
I find that different instructors use different methods to teach, such as using the "clock" method to calculate the cross wind component when others use the sine tables method, or a chart, and different techniques for the forced landing.
Try not to change too much once you've settled on an instructor, otherwise you just get a headache from being taught to do the same thing 3 or 4 different ways.