A lot of people say Rarity is a snob, but I really like her all the same. What can I say? She has great taste in clothes and lots of class, even if she can be be a bit superficial and materialistic.
I like Rainbow Dash too (she is SOOOOOOOOOO cool and awesome for her speed, determination, loyalty and overall athletic abilities, and her Sonic Rainboom is beyond breathtaking), but sometimes she CAN be a bit uppity. She has great potential though, especially as she learns "profesionalism" in Flight to the Finish.