for 3 or 4 or even 5 years, I can invest in Bitcoin with peace of mind that it will over perform Gold, but 10 years is a very long period that no one knows what technologies will be available at that time that may shake things up.
i think 3 or 4 investment in bitcoin will be a good investment. we can expect that after 3 or 4 years bitcoin will give you a very good profit, which we cannot expect from gold because gold is such a stable currency and may be very little difference in its price as compare to the present price.
yes actually gold can only keep your investment safe. but if you want to increase your investment then bitcoin is the best option.