Also, could you please consider the possibility that not every single person who supports either of the other two is a Pro Templar?
Or the possibility that being "pro-templar" does not mean "mage-hater".
Or the possibility that people can make choices without being in some myopic pro-something-or-other team at all.
At any rate, my primary problem with Divine Leliana stems from the same issue I have with Leliana overall in this game: I don't know where I stand with her, I don't know if I can trust her, I don't know how stable she is. She just seems to be all over the place, and the more personality-swings she piles on top of each other, the worse it gets. That is why "softening" her sadly didn't feel like much of an accomplishment -- it would take years for me to believe that the positive change sticks this time, that she won't crumble right back into her past patters or into outright Stabby McMurderpope behavior the next time fate farts in her general direction.
I understand Leliana's development from pre-Origins to Inquisition, especially since my canon is a dead Warden. Witnessing that sacrifice up close and personal would have been the first shattering blow, Justinia's death and the devastation of her peace efforts the second. Now Leliana fiercely needs to make sure that Justinia's last will -- the creation of the Inquisition -- is done, its purpose carried out, and her death avenged. Oh, and also the small matter of saving the world from destruction and a would-be darkspawn god. All that leaves a frighetening load on already-wounded shoulders. So yes, I get it, but that doesn't mean it's not worrying. Leliana needs to take care of herself and build a solid foundation for herself that doesn't hinge on other people, but sadly therapy hasn't been invented in Thedas yet, and I simply can't believe that the revelation in her personal quest is enough to create that huge and lasting a change in her. It is a good start, and her resurging faith will help a lot, but it is still only a start. I kind of want to make her sit down with Cole for a year or so.
If all this makes it sound like I feel she's a weakling, that's not my intention. To have survived everything she's been through is a sign of her inner strength -- but she was left badly scarred by it all, and really needs to sort herself out, both for her own sake and, if she is handed this much power as the new Divine, for the sake of the whole bloody world.
That aside:
Hardened Leliana as Divine sounds like a murderous monstrosity, the sort of bloody-handed tyrant that player characters are generally tasked with disposing of. At the very least she should be kept on a leash and closely watched (and good luck with that, since she is a master spy), but never be allowed within a lightyear of a position of power.
Softened Leliana as Divine is way too rainbows-and-unicorns-out-of-the-blue. Mind, I can't stand either the "if it's not grimdark, it's infantile" or the "perfect happy ending or my money back" attitudes, but I want something that makes a little more sense in the context of the world. Not to mention that the greater the changes to a setting, the more they should obey the cardinal rule of "show don't tell". You simply can't credibly do that sort of thing in a sentence or two during an epilogue slider ... especially in the light of the fact that Bioware has been known to play fast and loose with epilogues from past games.
Despite all that, I still sort of prefer softened Leliana for the simply reason that I want Cassandra to stay with the Inquisition, and also because the fact that Cassandra is not a politician at all. She is an intelligent woman who can learn, certainly, but lies and manipulation and pussyfooting around despicable people to convince them to see reason instead of drilling it into them will never come naturally to her ... while her rivals and the big players in the "Game" have a lifetime's headstart on her. I think she would be miserable before long. Leliana is technically the better candidate in my book because she combines faith and a desire to good (which she shares with Cassandra) with political connections and expertise. If she was more stable and her softened ending wasn't so over-the-top "perfect", she'd be my choice without hesitation.
But I still kind of want to suggest Mother Giselle and will never understand why she isn't an option and we can't even ask about it.