I have both the Fire TV and Fire TV Stick, and the Fire TV works a lot better than the Fire TV Stick. The ‘box’ is a lot more responsive and quicker.
@BigLou80
With the Fire TV Stick, when running it on the 2.4 GHz WiFi, I had tons of buffering problems. I upgraded my router to a TP-Link TL-WDR3600 and put the Fire TV Stick on the 5 GHz WiFi and all my issues disappeared. So yes, this is a point and case where poor WiFi was the issue even though I could stream Netflix perfectly fine on the 2.4 GHz WiFi before upgrading.
A great router for cheaper if anyone reading this thread is interested: