I was reading this thread and began searching for an article that I couldn't find that traced the contestants who have had long term success and Bob tends to beat Jillian in that regard.
But I honestly think this is about personality. I personally would do better with a Jillian. When it comes to working out and eating I use to lie a lot. Just to myself but still. I think Jillian is better at catching that sort of behavior than Bob.