Like many others, I find this a difficult choice every playthrough, in itself testament to good design.
In terms of gameplay and general feeling I prefer the mages. It feels more personal and has a better introduction, and I also feel the red templars make for better massed opponents than the venatori, as well as preferring Dorian to Cole, though such things are down to personal preference.
On the other hand though, there's considering the long-term consequences of the choice:
- If you side with the mages, you help them out, but essentially leave the templar order to get completely wiped out and converted to red templars. You also avert the threat of Alexius's dark future, but that future is caused by the inquisitor getting removed from the timeline more than anything else, so you basically avoid it by not siding with the mages in the first place. Dorian suggests that the influence of Alexius's time magic will spread on its own, but nothing seems to come of it.
- If you side with the templars, you help them out, but doing so also has beneficial consequences for mages in all the areas the inquisition can influence. The mages who are already in Alexius's grasp are by all accounts lost, but beyond them a restored templar order under a capable commander like Barris helps not only the templars themselves (likely to be able to weed out unsuitable elements, etc), but the remaining mages and people in general across Thedas as well, as the war table missions illustrate. It's really a chance to reforge the templars into what they should have been all along.
So in short it seems that siding with the mages = good for them but utterly screws the templars; whereas siding with the templars = greater good for everyone.
This tears at me somewhat as deep down on a personal level I really prefer the mage quest.. so I'm still undecided, every playthrough. I don't really see what people have against the time travel setup, and while I like Barris I also can't really see what makes him that special. But yeah, making my way through the future version of Redcliffe castle and seeing what becomes of everyone and everything really drives the feelings home. Maybe it's related to the quest you did in your first playthrough "sticking with you", but for me it sort of became canon.
Good post! Interesting analysis 