BItcoin is more popular in online market, but for real market (offline) gold is number 1, to get fast growing bitcoin is the best choice
No question about that because the fact says that the estimate user of bitcoin is just less that 1% of the total world population so that would already answer the question, I think there is no person in this world who does not know about gold, if you will ask them of course they will choose gold because that is money for them.
For a very wise investor, he will not limit himself or herself with investing either gold or bitcoin. That wise investor will invest to both gold and bitcoin along with other investment vehicles. Hence, if we can afford it, the best way is to diversify and invest to both bitcoins and gold. However, if your budget is really limited, then it is good to start investing first in bitcoin.