Directv has a lot of hd channels that really don't show any hd ,like: MTV,VH1,CMT, NICK.Dish has some channels that DIRECTV doesn't either, travel channel,WGN,LIfetime,Lifetime movies. That being said before DISH uploaded a bunch of channels like Sci-Fi etc, I was tempted to leave.
While I would love to have all channels in hd , it isn't the overriding factor in my decision to stay with DISH. Their 722 dvr is. It makes no difference to me how many hd channels there are with DIRECTV if I can't record the shows with their dvr. I had Directv for about 6 months this year and I had a lot of trouble getting the hr 21 to record reliably the shows I wanted it to. Granted if Directv had the 722 dvr , I would of stayed with Directv. To me the cutting edge technology is the reason I stay with one company over another.
As for audio dropouts, Both sat companies experience problems with audio/video problems on their locals especially. I think this has more to do with the encoders that they use for locals vs national channels. The national encoders are the latest tech and seem to work flawlessly. The local encoders are the older tech hand me downs and as such they experience more problems. I am sure that once we get all digital ota reception for locals and a newer generation of encoders for locals, that most problems will go away on both providers. I did see these problems on BOTH sat companies on the same locals. This could also be the local stations themselves having problems.