[folivier]

My opinion is that a Roku, or other streaming media player, is a better option than a smart tv. The different apps, Netflix, Hulu, etc. are more frequently updated and tend to work better with a Roku. The tv manufacturers don't seem to update the apps as frequently or at all. My Samsung is 4 years old and I've been using a Roku with it for about 3 years now.
Also I bought a 32" Samsung for my coach on black Monday that was advertised as having wifi but didn't. Bestbuy gave me a free Roku since I had already mounted the tv.
I'll let others talk about wifi. My experiences are a few years old and back then cell service for streaming wasn't that good and campgrounds wifi didn't have enough bandwidth for streaming.