Hands down bitcoin. 1 BTC will be worth more than 1 ounce of gold soon 
Yeah but gold is safe so it depends all on how much money we are talking about. If it's about millions then obviously i'll put it in gold but if it's not that much money i'll put it into bitcoin to try and make it more via that route.
but if you will have a good knowledge of bitcoin then it will be safe for you too. as you will not come to a position when you will lose money in bitcoin and in the future its value will increase and will come to stability so we cannot think that bitcoin is unsafe.