Who do you think gives the best overall perfomance in the Walking Dead?

Hey guys, I know people often post favourite characters and the like so I wanted to mix it up..... Past or present, who do you think was the best actor in the series? I know a lot of them are really good, and it's hard to decide for myself - I want to say either Andrew Lincoln (Rick) or Lennie James (Morgan) gave the best performances in this series. Thoughts?