The ones against this decision are sera and solas.
Siding with the templars or mages inquisition.
In origins it was more minor.
Whoever you do not choose becomes part of corypheus army.
If you side with the mages you lose ser barris who is one of the best templars in dragon age.
In the 2nd game the decision was everywhere and everything exploded to the mage rebellion.
In dnd i usually roll paladin so i sided with the templars and then on another play i did mages.
Theres no big difference other than when you get some party members and some dialogue options.
Enter the alliance with the templars and let them keep their independence this choice earns you blackwall s cassandra s vivienne s and the iron bull s favor.
Templars versus mages is a major decision thrown on the player throughout the series.
Disband the chantry of templars and include their soldiers into the inquisition this choice earns you sera s and solas s favor.
Inquisition on the playstation 4 a gamefaqs message board topic titled question about siding with the templars or mages spoilers.
I chose to side with the templars cos of the stat bonuses and the amulets for both cass and blackwall.