Eh, this topic is where you ask questions that you don't know the answer to, rather than questions on people's opinions e.g. questions like "What music plays in the episode When She Was Bad", not really questions on "What do you think is better?"
To answer your questions;
1) I like them both the same. Buffy does some things better than Angel and Angel does some things better than Buffy. If I was forced to choose, I'd say Buffy is better overall but I love both the same.
2) Illyria would win IMO.