On reading the first 3 pages you'd think that Rarity would have the lead, it surprised me SR has it!
This was really hard as I love both ponies and they both hve something annoying about them: SR's horrid symbol (you could have at least made it look pretty, Hasbro!), And Rarity's glitter explosion on her face (just on the horn would have been okay). In the end it was Silver Rain as I love the bold blue of her.