I made a family with 8 sims, all with 4 traits that won't really influence the criminal career (excitable, dramatic, easily impressed, and neurotic). I gave two sims the evil trait, two the good trait, two the lucky trait, and two the unlucky trait. I have made needs static so that the only different factor between the sims is the trait they have.
I am going to play until all 8 sims have reached level 10 of the thief branch.
I am about halfway done, and have also come up with some info about the athletics skill challenges that I don't think I have read about on this forum or any other before.
Results soon to come.