Season dependent I've seen seasons 1 and 2. In my opinion, 1 is significantly better, mostly because of the story structure. Each season is a single complex case with a lot of side stories, but in S01 they create an almost equally complex relationship between the two main characters. While the ensamble cast is excellent in s02, it lacks a strong relationship between any of the characters and instead has numerous, somewhat undeveloped ones. It's too bad bc the cast is strong and the background story is interesting, but they are missing that essential component.
I would say season 1 is a must watch, and season 2 is fine, with great actors/actresses, but a weaker story