Today we get to answer a lovely question from Ray. It has everything you need, honestly: favoritism, capitalism, and my soulless husk of a body. I'm so excited. Ray, I would suggest going to therapy for asking this question, but I'm not sure if it should be to book an appointment or apply for a job :P Sorry, you are much too nice to deserve this. It's a good question, it's a good question.
Seriously though, I can't answer this. My parents could see it, get me in trouble. I would want either of my parents to have my soul exactly the same. Most days I do something to annoy at least one of them, so I guess it would depend on the day and go to whichever one doesn't hope to strangle me like a farm-hen. In the interest of longevity, y'know. So it would be like a coin flip on the day of the dastardly deal, and after that I just have to be a good boy towards whoever wins the prize. Would it even be a reward? I would imagine it would be heavy, either physically or emotionally, I'm not sure. Whoever gets it would probably forget my soul at a chucky cheese and it would just sit there in the tubes, screaming out for them until it learns it can't speak. Crying without tears.
My final answer is I would sell my soul to Ray; the Mom of AGBB, which is confirmed because she sent me to the naughty step once (and it was totally L's fault). So... treat it well?