I have tried most tyres but not avon. I found dunlop's a tad quicker on warm up than Bridgestone, but it depends on what model of tyre you run. My son always uses track day/road focused tyres and although they grip like crazy they have to be pushed hard to get the heat in and they also loose heat quickly at rest. I don't think there is a bad tyre, it's a personal thing. I quite like michelins.