I can't answer re the prime way. I had free prime for a short time and when I checked out their acorntv service I saw that in addition to the monthly payment there are certain series that charge extra for episodes. That is the main reason I don't have prime, all the extra charges.
I have acorn on my roku, don't really have streaming issues with that. Sometimes the cc when going back to a paused episode. Only issue is their idiotic new format. But learned to deal.
Basically, I recommend roku, not prime.