Hotmail is probably the easiest to use and generally has offered very few problems for me. I do also have a Yahoo account but it isn't quite a easy or as intuitive.
I don't have a GMail account so I can't compare directly I'm afraid, however I've had my email address since about 2000 and I end up with about 10-20 emails per day directed to my junk folder correctly - very few false positives and only a small amount of spam gets through to my inbox. Overall I'd say it was pretty good for me.![]()