Should i watch the harry potter 7 part two movie first or read the seventh book first?

I have read all harry potter books except book 7 and i have watched
all the movies except movie 7 part 2. So should i watch harry potter 7
part two movie first or read the seventh book first? I know the ending
but I know very few details about it. I'm kind of thinking that i
should watch the movie first because people always say the movies will
disappoint if you have read the books first. What would you recommend?