I cannot speak of the Biewer, however I have both parti colored yorkies and standard colored yorkies and they each have their own personality to themselves but still have the general Yorkie personality and traits. Gotta get the ball, go go go, or nah I will just sit on your lap thanks...etc. But they are all independent, outgoing, active. So to me they are all the same just different perks here and there....
I prefer the naughty mouthy ones and my partner prefers the more laid back ones....to each his own.