hmmmm my babies are still young so this may change but right now, my little girl is has a "sweeter" personality and my boy seems to take to my fiancé and me more equally...
my little girl really seems to snuggle me more than my fiancé and is less hyper and more reserved...she hardly ever makes a peep either except for when she is playing with her brother

... she is just so well behaved i am often amazed she is still a puppy!
my little boy seems to love EVERYONE and has not met anyone yet who is not his new friend

lol ... but he is really hyper and kind of "yippy" ... but my little boy is catching onto the whole wee pad and "sit" command much better than his sister
they are both too cute for words but personality & behavior wise my girl is much sweeter and calm...but my little boy is such a little lover and wants to give kisses all the time!