System-based econ books tend to be more complex/science than behavioral. I've recommended a couple favorites: technological revolutions & financial capital by carlota perez (a personal favorite), innovator's dilemma (touches on and tests fundamental econ principles), etc.

Behavioral econ has typically skewed more pop sci but a few good ones that are a bit more academically rigorous are: thinking fast and slow, most of hymen minskey's books, irrational exuberance, on grand strategy, most books on game theory, etc.