I don't know what the advantages would be to you, Khandro, as I don't know your set up nor what you want.
I like Amazon Prime Video - they have some great series and I very much like the Xray feature especially when I'm trying to identify an actor or piece of music
https://www.amazon.co.uk/gp/help/customer/display.html?nodeId=201423010
If your tv is 'smart' you can probably get Prime Video without buying a gadget.
I have no idea if the content is available anywhere outside the UK, I haven't tried to access it when I've been abroad.
I don't have Fire TV, I access Prime Video through the app on my tv or through my Virgin V6 box
This link gives you all the information about Fire TV
Amazon.com User Recommendation