I choose both, gold and bitcoin are great for long term investment and have been proven for a long time, but for now I will priority to bitcoin because it can get profit faster than gold.
I agree with you, it's just safe to diversify your investments and have them in both ad the future is uncertain for both commodities. Gold has withstood the test of time and could have easily been chosen as the better choice but Bitcoin is rather out performing hold with its blustering rate of growth.