actually, i think you can't say that either is 'better', per se. they had different aims and different approaches and just different energies overall. on the whole i think i have to say i actually prefer angel, but in my eyes that doesn't make it 'better' - it's just different.
angel, for the record, was about much more than the character of angel. in fact, i think, similar to buffy, he was probably one of the more boring characters on the show. it was the ensemble work that made angel great, same as buffy.
*/pretentious ranting*