You take Viconia in your party if you want a full cleric and can't stand Anomen.
Also, from a min-max standpoint her stats are pretty good (Anomen can be good too though).
In the first game Branwen is a pretty good single-class cleric.
Yes, she is. Viconia has spell resistance and very high dexterity, so that probably makes her "better" if you don't mind the evil. At the end of the day the game is easy enough that it doesn't matter though.
