I think I will compromise... My memory is awful so if I watch a TV series/movie and then leave a gap of a year or so, I could probably then read the books and not remember too many of the details. And vice versa with reading the books first.
I watched all the series of
The Sopranos,
The Shield,
House M.D. etc a couple of times each, after leaving a few years between binges. I only had a few moments here and there where I remembered what would happen next.
I'm looking forward to eventually watching
Breaking Bad and
Better Call Saul again after a bit more time for plot-forgetting.
It is one of the few advantages of getting older - being able to enjoy the same things over and over without getting bored of them!