While I've often faulted Dish for some of their outages, particularly a long one in our area with a smaller locals company, in this case, from what I perceive (and we never really know, it's remarkable how there are never any good leaks) I'm with Dish. AT&T owns Directv, so what a great way in their mind to give Directv a competitive advantage. "If you want HBO from your satellite provider, Directv is your only choice!" Sounds like a great reason to null the AT&T/Directv deal.
We watch HBO purely for original shows, I can't remember the last time we saw a movie that wasn't very old or very crappy on there. But their lineup of original programming, from True Detective to GOT to Barry, to a lot of older superb series we're catching up on (e.g. The Wire, Deadwood, and more) plus some of their documentaries,is outstanding. I preferred to get it on Dish for the simplicity and also because I usually could get it discounted vs. the $15 per month we pay for it on Amazon Prime, but my Harmony remote is one button push for Dish and another button push to bring up my Roku, with programmed buttons for Amazon Prime, Netflix and Hulu. Hulu is the least watched of those three by far. We actually usually watch Netflix on the Dish but it's simple to switch to it on the Roku. And I like how Amazon Prime integrates HBO in to it's programming and guides.
Honestly, if we could just pick the 20 or 25 channels (including locals) we watch via the Dish Flex or whatever it's called and save money we'd do that. Our problem is by the time we add the locals and the sports to the channels we watch, the cost is about what a higher end Dish package costs anyway.