This is a comment driven story
The name's Bon Bon, or Agent Sweetie Drops, if you prefer. My mission right now is to track down a mysterious pony named Starlight Glimmer. That's all the orders my boss really gave me. He tends to be vague like that.
Oh and here she comes walking down the street. Ponies run and hide, but I stand still. She waves her hooves about, preaching her values, asking us to commit to her cause.
And then there's Twilight, coming from the other end, her horn blazing with magic. Oh my gosh... This is going to be one heck of a fight.
Bon Bon joins Starlight is my vote.
Join neither. Be a ninja! Get Starlight out of there without revealing your awesome skills, while Twilight is distracted.
-Inkheart
Join neither.
If you go with Twilight, you betray your boss.
If you go with your boss, you betray Equestria.
Join Starlight. Betray EVERYONE!