Most of my collection, I've had since babies. I've brought in three adult females (two have moved on to another owner who was able to breed them this year) that were pet store surrenders.
One was a very nervous snake, who struck out in fear a few times. The other two - absolute dolls.
I'd have to say that I "know" my kiddos that I've raised much better - as in I know how to read each of them, I know which ones are easily ticked off, and which ones are laid back. Which ones I "trust" (as much as you can trust a wild animal) to be more tolerant to handling if the neighborhood kids ask to see one when the weather is warmer, and which ones would not react as well.
I adore all of them for their own individualism.