Welcome to Satelliteguys!!
You'll get a lot of people on either side of the fence telling you what's great about each provider.
What I can suggest: Look at each package, and each provider's new customer deals, and see what's best for your money.
One thing I do like about DISH's DVRs: the 625 can be used for 2 TVs but only need the one receiver, saving you a mirroring fee. If HD is in your future, than right now DISH has more HD channels.
Directv did have the Tivo for the longest, and I think that was their best selling point, but they have gone to their own DVR now, and from what people say it's not nearly as good as the Tivo was.
If you're an NFL fan, and you don't mind the price, than Directv would be your better choice since they offer the Sunday Ticket deal.
Keep reading both forums and I'm sure you'll be able to find the best deal that's best for you.