I think your opinion of Daryl may be a bit biased based on the knife he carries.
Daryl wasn't that likable in season 1. I don't know what was up with that--the writers changed their minds on what they wanted him to be with season 2? Or they did that deliberately to show his "evolution" or something? He is a pretty cool guy, and he's my and my wife's favorite. True BAMF for when you want to get in touch with your primal side though the writing for his dialogue is weird at times.
But I do like Rick. Why?
SPOILERS AHEAD though I doubt no one here hasn't seen everything already
He's the level-headed one who makes the hard decisions and takes the burden of everything on his shoulders. That has sort of been his thing throughout the comics, as well, but I never really saw it too clearly in the show until the season 2 finale, when everyone saw Sophia shambling out and froze up and cried and whatever, and Rick knew what he had to do. Watch it again. His face changes, and he shoots the girl without flinching, because no one else wanted to for several reasons. He might be weak depending on your zombacalypse survival philosophy, but he's strong in his own way. I can't wait for season two to resume just to see the different reactions everyone has to what Rick did. He has a place and an important role in the show, changing it from a man vs. wild zombie killfest to something the show is supposed to be about. In that sense, Shane and Daryl are good balances and keep the show interesting with conflict as well.
By the way, it was Daryl who turned me onto the Team Gemini. It didn't appeal to me at first, but now I have one and will order at least one more.