What is the best tactic on Dragon Age Origins

Well that TOTALLY depends on what class you are and what your using for your talent tree. I only know a few, but i'll try to help as much as I can.
Rogue-Scrapper is almost always the best, it puts all the main combat moves into one tactic.
Wynne-Healer is the best since thats what she is made for.
Alistar-Tank since he is the toughest in your group.