I believe that there is no best pony. However, my top five favorite ponies are:
1) Derpy Hooves (I LOVE HER! Just not for the same reasons as many others.)
2) Octavia Melody
3) Rainbow Dash
(4 and 5 are both non-cannon, but still make the top five)
4) Nyx (Go read Past Sins by this lovely author.)
5) Rainbow Blitz (Go read Graphs by this eccentric author.)
Honorable Mention:
Luna is best princess. Celestia can go suck it.
2148111
It was a fantastic story. I hope to see more of it in the future!
Thanks for favouriting Synthetic Bottled Sunlight!
1389631
No problem! It was hilarious and silly. I loved it, even if I didn't get the reference, even after looking it up.
Thanks for faving Twilight Sparkle Pierces The Heavens!
1342750
I am proud to be in your army, sir!