The Piper Spot 

I like them both but I'm leaning towards Piper. Reyna is good too, but when she was first mentioned in TSoN I thought she seemed kind of bossy. I'm not saying that Piper's perfect, I'm just saying that I like her more then Reyna. A lot of people say that Piper complains a lot, but I'm not really sure where that comes from. It's kind of a hard decision, because there are both awesome, and they could be really good as just friends.
I don't HATE either of them, because that's just cruel. None of the characters from PJO or HoO deserve any hate because they are all incredibly worthy characters, who just have a different way of thinking to most people. Anyway, sorry going off topic, but, basically, I prefer Piper, because she seems like a kind of fun person to be around, whereas Reyna seems a bit too formal and bossy.