Pro's are multi millionaires anyway.
Yep. If you suddenly would get Sergio's genetics today you would be multimillionaire pro bb.
When you have millions you can do pretty much everything you want. No need to go to billions.
Plus no matter what anybody says, you can't make Gates look like pro bb even with all his money. So choosing Sergio's genetics and make successful carrier in bodybuilding wouldn't be bad choice.
I would go with Gates' wealth though