Fandango or Amazon Prime?

So I don't subscribe to Amazon Prime; however, I am aware you can still purchase titles to "own" via Prime. I also don't currently have a Fandango account. I am looking to purchase a TV series to "own" digitally.

I am looking for the pros and cons of using Prime vs Fandango in this manner.

While the impetus for this decision is a specific TV show, I am open to continuing to purchase/rent items from either service depending on the pros/cons of each.

Any advice?