Runners-up: Beetle Bailey, Dennis the Menace, Family Circus, Frazz, Garfield, Hagar the Horrible, Prickly City
Darby Conley is another master of the character driven strip. Of course he is also adept at writing joke based strips, because he has a great ear for dialogue. He also might be the best artist in the business today. I love how Bucky seems proud of his fighting prowess in the last panel and how concerned Satchel is about his teddy bear.
Runners-up: Agnes, Cul de Sac, Dilbert, For Better or For Worse (character driven in a bad way, it's easy to dislike many of the characters; today's strip made me smile though), Non Sequiter, Opus, Rhymes with Orange