My suggestion is to go to Best Buy and spend sometime asking questions and looking at the quality of the picture. I suggest best buy because you can talk to someone that actually knows a little about each TV and FABs. In turn the associate at Best Buy should ask you some questions such as what do you normally watch, what is your cable or ISP, understand your viewing environment etc
In our house we use Roku, Apple TV, Fire stick and a couple of Samsung TVs with their own service. I prefer Roku but I like them all and this can likely be attributed to the fact they are the screens I watch the most.