Who makes the best class c motorhome?

Winnebago and Fleetwood probably have the best reputations of all of them. Of course, you want it to be built on a reliable platform, so you'll have to be careful of which chassis it's built on. You could have a great motorhome, but if was built on, say, one of the Econolines back when they offered the 6.0 Powerstroke, you were going to have a lot of problems.