From watching more and more My Little Pony, I've come to realise that Pinkie Pie is more and more awesomer than the rest of the ponies. One time, Twilight Sparkle trolled all of Ponyville, which was kinda cool I guess, and I'm not liking Rarity all that much now, after the episode with her and Applejack in it together.
My order of favourite ponies are Pinkie Pie, Rainbow Dash, Applejack, Flutterguyshy, Rarity and then Twilight Sparkle.