I prefer Equestria Girls. Equestria Girls had more plot variety and better character development for its characters, IMO. And the music was better too.
It's pretty cool how they made all the sciencey-stuff she says actually accurate. She's an interesting character and says a lot of interesting facts in the show.
She's always able to help her friends even if she overdoes herself. And if her friends are upset she focuses on them and gives it her all to make them feel better.
Best EG character, IMO. She's strong and smart, and she can admit when she's made mistakes, but doesn't let them define her. And has the best character development in the series.
The op post one appears to be closed, so here's a link to a new petition I found:
https://www.change.org/p/boulder-media-can-boulder-media-save-the-equestria-girls-series?
Fake it Til You Make It, 28 Pranks Later, No Second Prances, Newbie Dash, Non-complete clause, Somepony to Watch Over Me, Parental Glideance, Mysterious Mare-Do Well, Dragon Quest, and Apple Family Reuinion, and Student Counsel.
Twilight (Runs a Kingdom)
Applejack (Runs a farm)
Rarity (Runs a business that has lots of shops)
Fluttershy (Takes care of lots of animals)
Rainbow Dash (Is an athlete)
Pinkie (Party planner)
Applejack has always been my favourite of the 6. She's an athlete, has some funny and creative lines, an honest pony, a hard worker and she seems like she would be a very good friend and an easy pony to get along with. She has some great episodes.