I use to see this. In labs I think its true - chocolates are NAUGHTY.
However I think in our breed it is related to lines. Show lines tend to be black and tans, working lines tend to be sable. So in general those colorations are going to have different temperaments and drives. I've yet to meet a stable white GSD, but because most registries dont accept white finding a good breeder is very hard to find so a well bred white GSD is much harder to come by.
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Berlin vom Spartanville 1/13/13
2008 - 7/23/12
"Take this trouble from me: Make sure my shepherd dog remains a working dog, for I have struggled all my life long for that aim." Max Von Stephanitz