i don't think it is entirely right to compare gold and bitcoin together. both of them have similarities as an investment so you can compare them in that aspect but bitcoin is much more than just an investment so that makes it different from gold, different better that is.
Correct their are similarities; mining, investment etc. but they are also very different. Bitcoin is mainly meant for creating transactions, alas being a payment method (a currency). While gold is used to back up currencies, since it is very stable.