If I was required to answer with one of the three shows listed I would say The Walking Dead. However, there are just to many bloody good shows. Easy to fill up my media recording/streaming servers disk space with shows. I'm a bit behind on some of my recordings too.
For me, if I had to widdle it down to a few well. I liked Vegas before it was canceled, Hannibal is not bad for its twists, Longmire is interesting for the whole westernish cop feel, Salem is cool for its rugged witch hunting deal, The 100 is out there for its survival future ordeal, Continuum I like for the time travel nonsense, Rake I like the "I don't give a" vibe of the lawyer (It is kind of funny in some ways), and Sirens is a comedic show I liked watching.
I liked watching this show back in the day, there was no comparison. Now I watch some of the episodes and cringe. I'm not sure why I thought it was so cool at the time, but I remember planning my week around it. I had to be home on Tuesday nights to watch or else. lol.
I think the show was a pioneer in a lot of ways. Going through it was great and maybe I should just let it stay a great memory rather than rewatch from my current point of view.