Both located in this group's folders, there is a difference.

Adventures of Derpy Hooves is a story I'll have people help me with at times, yet it is my story alone.

There is a very simple difference.

ADH-- Derpy is best friends with Lyra, Bon Bon, and Vinyl Scratch, and is purely the main character.

SV-- Derpy isn't best friends with Lyra, Bon Bon, and Vinyl, and is equally the main character along with Twilight Sparkle.

Enjoy that.