I believe Epson now uses most of bills techniques to make their profiles, and I've found EpsonUSA profiles to be very good for the 4800/9800 printers I have.
That being said, I still feel Bill is king, and if he makes a profile for a paper I will use it before I use the manufacturers profiles.
Interestingly enough he recently added some profiles for Kodak Professional media, which I personally like better than Epsons media especially their lustre. Not sure why he posted them unless he has started using it as well.
Better of course is relative ... on a scale from 0 to 10 we're talking a small fraction to describe how much better I like it ... they're both very nice papers if you are after a traditional color photographic look.