Nope the best one is Bitcoin only, It is easy to trade than traditional gold. Border-less, you can carry bitcoin anywhere in the world. But gold needs a lot of formalities. Some people argue diamonds are border-less. But it can not be traded in minutes. So, bitcoin is greater than anything else...
I won't say that the best one is only bitcoin. Gold is good, bitcoin is good. It is just going to depend on how you are using them.
If you are a gold trader and then you are getting good profit from it then gold is the best choice for you.
Same thing with bitcoin.
For me, you don't have to choose one from them. As long as you are able to manage them properly that's not going to be a problem.
If you want to max out your income then go for many source like gold and bitcoin. If you are just going to focus to only one, you are
not able to max out your earnings.
For an long term investment you can use gold and bitcoins both but if your focus is only a short term than go for investment in bitcoins only.