Right now, D*.
E* is in the process of adding satellite capacity, but it's going to be awhile before it'll be ready for use for programming. As a result, they're still crushing the HD signals a lot. It's not as bad as D* was with the old MPEG2 stuff, but D*'s new MPEG4 stuff is much better. There's also more of it.
Keep in mind, that's just right now - 6 or 12 months from now, the tables could turn the other way.