Gold for me. Its worth a bit more and will probably increase in value over time. Money will lose value over time.
Since I don’t plan on spending it all at once, right this moment, it works better in my favor if it appreciates in value. I’m too much of a pussy to invest, so I’d probably let the bills rot too.
I’d sell the gold bit by bit, underground if need be, to avoid taxes.
I’d pick money only if I actually needed 50 million in cast right now.