Origins is better, in my opinion. It's the black sheep but it's my favourite in the series.
Arkham Knight is my least favourite but I still like it. If you really hate the tank sections, though, you might not like it no matter how long you play. That's a pretty big part of the game, and it's not great.
The story is also dumb.
major story spoilers
It would have been way better if Barbara was the arkham knight, having faked her death and the suit could have had mechanical legs to help her walk and her voice digitally altered to sound like a man. Instead we got another Jason Todd as the Red Hood with a different name.
ETA: I'm curious whether the downvotes are because I think Origins is better or because you don't like my idea for how the story could have been improved.