Most everybody is going back and forth on who is better, Pinkie Pie or arco iris, arco-íris Dash. I'll give you 5 cool facts about both ponies and don't forget to comment your opinion in the comments!!!
She keeps everybody in Ponyville smiling!
She is the best party pónei, pônei ever!
She shares a voice with Fluttershy
She grew up on a rock farm
And she got her cutie mark from her first party
Without her sonic rainboom, none of the other main ponies would have cutie marks
She is a serious speed demon
Is one of the only, if not THE ONLY pónei, pônei to do a sonic rainboom