A little bit of both, so you can be on the safe side. Bitcoin more risky, but more rewarding .
Yes indeed, if the bitcoin will collapse you still got something where you can make profit with so its a backup.
And its also working in the opposite if the gold will collapse in the market, what will not happen of course.
Gold is better to invest for a long term if you compare it with the bitcoin market, the bitcoin is just a digital currency.
The gold can be touched and is more secure to hold long term because since we are born we already pay with gold and know it.