I sided with Branka, despite my Mage being basically a good guy type hero. I couldn't pass up that kind of usefulness given the threat of the Blight. My decision was ultimately justified by how much the Golems helped in the end. Wynne wasn't there for that part, even though I had had her around for nearly all of the game. Someone had to make way for Ogrhen, and I didn't want to leave Alistair my tank behind, or Zev too many traps and chests around to not bring a Rogue. Alistair also disapproves quite a bit if you side with Branka. Totally worth it though, Golems are badass, they are awesome against the Archdemon. Just make sure to keep them healed, and victory is inevitable. A true Grey Warden should always side with Branka, IMO.