My kids are a good mix...so while one is better one way the other is better the other way.
My oldest is very shy and reserved and a huge rules follower. So while she won't jump into new situations on her own or talk to many people she doesn't know. She does follow rules perfectly. It makes her a great student and it was easy to discipline her when she was a baby. Oh and you know that age where they don't want to sit in shopping carts she was aces, because even though we would let her walk, she would never run away because she was too afraid to go anywhere without mom or dad. However, she is my drama princess and tends to have complete meltdowns when things don't go her way. (Although she is getting better) Oh and she never slept in her crib, no matter what we tried she wouldn't. And even to this day, she needs someone in bed with her. (Luckily for us, now its her sister)
Her younger sister on the other hand, went in her crib no problems. She was/is one of the kids that gets over things quickly. Which worked out perfect being that her older sister always seems to tear things out of her hands that "she can't play with" This daughter has always moved on quickly and rarely lets anything upset her. On the other hand, it takes quite a bit to discipline her. And she seems to get into more things than I ever remember my oldest getting into things. However, she is friendly, outgoing and can be the center of attention in her absolute cuteness.
I wouldn't change a thing about either and am so happy they both are different in their both ways. Someone asked me one time which was easier to raise and I said, they are equal because they both have their faults but both have really wonderful individuality about them.