Gold is easily detected by metal detectors and xray scanners.
If the government wants it they can confiscate it. If you ever find yourself in a situation where you need to move across geopolitical borders gold is dangerous to move. Ask the Jews how it worked out for them when they were fleeing Germany.
Bitcoin can be stored in a string of text as small as 34 characters, this can be memorized if need be. Only the first 8 are needed to check the existence and balance of the coin. The full address is needed to spend it.
Places to store this string of 34 characters... use your imagination.