Stick with YouTube there is more free content you also have the ability to purchase and watch movie and yv shows you can purchase on the Google play store or other digital stores.
personally i would go with disney plus+ bundle for $13 which includes espn plus disney and hulu and netflix. I had amazon video for a month i hated it i would go through movie genres try to click one o look at that i have to buy HBO. Than i would go search another click it o look at that i need to buy EPIX. To me Amazon video is most useless out there unless you get cbs nbc fx epix hbo showtime and all the channels with your current tv which is kinda reason you get away from paying satelitte the high prices right? my suggestion is find a show or multiple you like with maybe 1 company buy it or choose the netflix/disney plus bundle
I just rotate all of the big ones every month or so depending on what I feel like watching. Usually only watch 1 series at a time so this is easy for me.