A lot of the best ones are slow-paced. More room for character development.
Speaking of which, how did I forget to mention
Freefall? Great strip, especially if you enjoy science fiction and the civil rights of robots and artificial intelligences. The main character is Florence, who is an anthropomorphic wolf in an otherwise human world. Some scientist named Bowman genetically modified wolf DNA so the wolf would have the capability of walking upright, speaking, and manipulating things with hands, and then took the same basic framework they use for robot AIs and somehow got it to run on a wolf's brain instead of an electronic brain. There are only about eighteen of these "Bowman's wolves" in existence, and if Florence is a good example of them, they are scary smart but super friendly. Which is good, because if they don't pass their "field trials", the corporation funding Bowman's research will pull the plug on the whole program...
Has some absolutely fascinating insights on how an intelligent wolf might be different from humans -- Florence feels all sorts of pack behavioral instincts, but can articulate them clearly to non-wolves as well. And she was raised by humans, so she has a good understanding of human social dynamics as well, but it's learned, not instinctive, so she needs to reason her way through some things that humans don't even have to think about.
And civil rights? Robot AIs don't have 'em, and Florence is considered a non-human AI effectively equivalent to the robots, so she doesn't have 'em either. Although she deserves them more than many humans I can think of...
Edit: Forgot to mention that Florence has an advanced degree in starship engineering. Did I mention she was smart?
Edit edit: Oh, yeah, the original poster asked for "slice of life" comics. Well, Florence's life may be taking place some time in the medium-far future, but I think it's more than fair to call Freefall a slice of
her life. The external trappings of it may not seem much like your own life, but under all that she's just a gal looking to move forward in her career, make friends, and maybe even find a special someone...