I recently cut the cord and went with a 4 tuner Tablo (I watch way too much TV), supplemented with Netflix, Hulu Plus and Sling TV. There is a special deal on Showtime subscriptions if you also subscribe to Hulu, but I haven’t felt the need for either Showtime or HBO. Of all the services you noted, they’re all available on the Roku, plus tons more.
In my setup, I have the 4 tuner Tablo, plus 4 TVs, each with a Roku stick, that allow me to watch live or recorded content from Tablo on any of the 4 TVs. I can even access Tablo content remotely on my phone or tablet, once they’ve been paired with the Tablo on my home network.
So it looks like you’re going in the right direction. Fire TV is a good choice, especially if you’re also an Amazon Prime subscriber. I went with Roku because at the time I decided to cut the cord and go with Tablo, I already had one Roku device, and after everything was proven in to my satisfaction, bout additional Roku devices for the other TVs.
Once the new Fall TV season kicked in, I’m finding that because I’ve recorded a lot of new premiering and returning shows, that the ability of Tablo to record all these programs has outstripped my ability to watch them. I seem to have a constantly building backlog, so if I was worried that I might not have anything to watch after cancelling DirecTV, those worries have proven unfounded. With my Tablo backlog, as well as streaming services to which I’ve subscribed, I’m never at a loss for something to watch.
Two important considerations to keep in mind are getting the best antenna you can for the channels available in your area, aim it properly, and if possible, do not go through a splitter… connect directly to Tablo for the strongest signal and best user experience. Also, do not skimp on your router,… the TP Link Archer C7 is the one I have, and it’s an outstanding router for the money. These 2 things are really important, from what I’ve seen, in maximizing you chances of success with Tablo.