I personally like Applebloom the most. While Scootaloo's character is okay, she kinda got irritating to me, and Sweetie Belle doesn't really seem to have much character herself. :I
I struggle to find any favourites in the MLP universe, but I find that I can be a tinsy bit irritated from Rainbow Dash's and Scootaloo's character (attention seeking and brash) from time to time. Scootaloo is pretty cool on a scooter though. I just think I prefer Applebloom because she has been in the series longest, and Sweetiebelle for her character design and sweet singing, something the other crusaders lack.
I would have to say Applebloom. Cute, yes. Clever, yes. Cutie Mark Driven, yes. But, also, she was the only one that wanted to befriend Zecora - something even Twilight wasn't sure she wanted to do. Plus that whole scene with Applejack being terrified and Applebloom just pushing her away always gets to me.
It's a tie between Apple Bloom and Sweetie Bell for me. Apple Bloom is funny, outgoing, and creative, while Sweetie Bell is shier. If I had to say one, I would probably say Apple Bloom, only for the sole fact that Sweetie Bell hasn't really done much. Maybe there will be an episode focusing on the Cutiemark Crusaders as individuals in the next season. As for Scootaloo, The Cutiemark Chronicles pretty much ruined her for me. Its cute how she looks up to Rainbow Dash, but I think they took it a little too far...
I'm not too fussed on them, but Sweetie Belle is probably my favourite. More laid back and reserved than the others, a quality that appeals to me. Applebloom wasn't bad, pulled some funny face and was pretty adorable, but had some downsides too. Scootaloo just annoyed me, it's like she has all the qualities of Rainbow Dash I don't like, but none of the ones I do. Aslo, I don't know why, but the fact that Sweetie Belle was Rarity's little sister makes me like her more.
For now, it's Applebloom, but there's still much development needed for these three. I can't wait to see how much they develop in Season 2.
Tie between Sweetie Belle and Scootaloo. Sweetie Belle because she's a bit..."ditzy" (and loathes unintelligent fabric). Her being Rarity's sister also helps. And Scootaloo because she's Rainbow Dash 2.0. Oddly enough, I've heard lots of people say she was the worst part of Cutie Mark Chronicles, but I personally really liked her during it. "Hey, how about a song?" "NOOOOOOOOOOOOO-"
applebloom because well she is cool, smart like aj, cute, and strong. she has perfect guilt trip eyes. im a *squee!*in wierdo
Applebloom because she is so cute! Especially when she makes the face in Episode 1 when she asks Twilight Sparkle to stay. She is also very good at some things. I hope one day she will get her cutie mark.
Applebloom, because she's adorable. All three of them are a little annoying though, how they're oblivious to what their talents are.
I'm going for Scootaloo on this one because I'm still wondering on how they supposed that she's Cherilee's younger sister when Cherilee is an earth pony.