What's the Mecool Km choice?

I've be researching Iptv for about a month now and based on my affordability I like the Mecool Km range. Now there are about 9 models to date so which would be the best to buy. I would have bought the latest one but some people saying there compatibility issues with WiFi and TV`s.

So the question is which is best MecoolKM version box to buy? I'm from UK so is it OK to buy it from Amazon?