I guess for me it would be more dependent on how this "bidding" process works....do you just automatically have this bid you can use at anytime or is it only a few selected people every year or something?
I guess basing it off of that you have that option at anytime, I would just stay in "A" and live the easy life and saving the bid for the chance something better may be invented in the future or if things turn sour with your position being replaced with automation. Though personally I'd probably always choose A since work is just paycheck, and I'd rather spend most of my energy on play.