Interesting thread.

I've had apricot, white, sable, silver and black poodles and while they were all very different, I'm not sure I can attribute these differences to their coat colors.
Brandy (apricot) and Lord Byron (white) joined me in their golden years, and both were pretty much set in their ways. Brandy lived with a decent family his entire life while Lord Byron ended up on the street as a stray. Brandy was
tough--Chesty Puller tough--while Byron was the sweetest, most sensitive soul I ever met.
Pippin is a sable and is very, very high energy and somewhat anxious. He's smart and eager to please, but is easily frustrated. Short and sweet training sessions work best for him.
Merlin (silver) is not mean or "bitey" at all. He's 100% lover and not fighter. He's a very sweet and intelligent boy, who like Pippin, has trouble focusing, but when he does, nothing can stop him.
Alex, my black and my once in a lifetime dog, is what I'd call a perfect dog with an ideal temperament. He's calm/laid back but can be energetic, he's a love bug, loyal and the most intelligent dog I've ever met. He taught himself most of the basic commands: Sit, stay, down, shake, high five, and up, along with "get your toy" and related. He taught himself to walk on a leash. He has incredible focus and can learn anything after 5 repetitions. (I'm not kidding.) I've never had a dog who can focus like him. There's no frustration or anxiety in Alex, and he has taught me more than I'll ever teach him.
Blacks are my favorite in both look and temperament (of the poodles I've lived with). I love them all, don't get me wrong, and I appreciate their differences. But I think everyone has that one special dog they just click with who will always hold a
very special place in your heart and mine just happens to be a black poodle. (Of course mine all hold
special places in my heart.)