paper, fundamentally worth nothing, backed by government's approval but is lighter to carry
gold, fundamentally worth nothing, also backed by government's approval but allows me to carry large sacks filled with doubloons around in the trunk of my car, which i can paint to look like a 1580's spanish pirate galleon
paper means less muscle mass but less hernias
gold means i can pretend i'm a hedonistic nobleman from borgia-era italy but requires investment in oak or steel coffers
tough call