I am partial to quite a few, Pinkie is just hilarious and awesome, Twilight is the level headed mage one , Fluttershy is a precious cinnamon roll, Rarity actually I can relate to with those inner anxiety, AppleJack is honestly cool. So if I had to pick between the six as which one I like best (agony of choice) I think I'd go for Twilight with Fluttershy and Rarity tied in first place too