One other thing to note is that if there are areas where Comcast is the sole internet provider, with no competition from Google or ATT fiber or anyone else, then it's likely they've got you trapped either way. That's the situation with Spectrum at my house here in the Austin area, there are no competitors so if I want broadband internet upstream and downstream, I have to use them.
So they have a streaming package that you can bundle with them and "save." But if you decide you want to ditch their streaming service and move over to Hulu Live or YouTubeTV or Sling or whatever else, then you're now UNbundled and the price of the internet-only service increases to the point where any savings from moving to another streaming option, are completely offset and eliminated.
You still might see some benefit with the other streaming service (such as, it has the B1G Network while Comcast does not), but there's no potential for actually saving any money, they've priced that possibility completely out of the model.