I voted for Cangel. Cordelia and Angel had this amazing connection that started out from annoyance and became friendship, and it was a mature and realistic relationship that blossomed into something that was beautiful. It was complicated, it was emotional, it was gripping, it was *real*. What Buffy and Angel had was an immature fairy tale love. All they did was put their relationship above all other things, hoping that it could sustain them forever and ever. Eventually they came to understand that, even though there will always be that love between them that is like that of a brother and sister.
Angel definitely would not just forget Cordelia, throw away what they had, and run away to Buffy. Cordelia will always be in his heart, and she's really, the one for him, and he for her. Cordelia was able to bring out this reluctant shell of a vampire and change him into a better person. Angel, in turn, changed Cordelia into a beautiful, amazing, and better woman. Argue with me if you like, but you just can't compare to that.
Joss and the writers didn't create all of this beauty for Bangel fans to just throw away the resonance and message of Cangel, which was a better relationship for Angel and for Cordelia.