Captain Marvel. I say this because since Kelly Sue Deconnick started the series, Captain Marvel has become one of my favorite characters. Shes strong, funny and just fleshed out really well. Wonder Woman i can read when shes in team books like Justice League but I've never had the desire to read her solo title.
Kind of ironic since Carol Danvers is not the character in Kelly Sue DeConnick's series. That's some bastardised version.