I also liked Angel more than Buffy. Angel was more consistent in quality (yes, I liked season 4 as much as the others), while Buffy had both great seasons (second part of 2,3,5, most of 6) and average to bad ones (1, 4 and second part of 7).I love both series, but Angel just blows Buffy away in the later seasons. I envy anyone who is experiencing this for the first time now.
Angel also had much less annoying characters (maybe Connor some of time). On Buffy, Willow annoyed me pretty much from season 1 - first it was "look, I'm a geeky girl, nobody loves me", then it was "I do magic! Seriously, a lot of magic!", then "look, I'm lesbian and I do magic!". Alyson Hannigan is a good comic actress (like in American Pie movies or now in HIMYM) but when she tried doing something dramatic, it looked bad ...
I should rewatch both shows.