It can be both since it in the end its value and function is based on its users though right now it is more of an investment because of its market value it is still a currency, its volatility just makes it hard to use as a currency now.  

I think it's both.because you can easily invest  as much as you can  and earn profits. A digital gold although it doesn’t have the actual form , it is still precious as gold. You can still sell it more than the value of gold. You can still use bitcoin as cash in any payments of buying things or paying hotel accommodations or even in food chain like in kfc.

proponents of bitcoin as "digital cash" place more emphasis on the accessibility aspect ,arguing that its transaction fees should be low, Whereas proponents of bitcoin as "digital gold"are more focused on its security, arguing that this should not be compromised by efforts to lower cost.

in my opinion bitcoin is .and will be both: digital gold and digital cash

Bitcoin is digital cash, but his potencial is very above then the gold, soo some people does use bitcoin to store value against their fiat currency, as well used for saving purposes as well investment at the same time. For me bitcoin is the digital gold, with amazing potencial to grow.

Bitcoins are considered as valuable assets such as gold. The bitcoin algorithm can be considered digital gold because it carries the same characteristics as gold, silver, precious metals. However, gold has long been considered a safe haven for the entire length of civilization. It has been used by all cultures, of all ages, for value and has never fallen to zero in history. The value of bitcoin can go down.

The beauty of bitcoins is that it can act as both those forms.
I think Bitcoin got the Gold Tag because It is something that you can preserve
That is if you believer in it. It acts as a market stablizer for the entire market.
so even if there are better more technology wise advance coins than bitcoins.
Bitcoin still remains the best because It is like Gold. It is also the Bridge between Fiat and other cryptos
And even if all the world leaders got together to make something better, people will still only trust Bitcoin more
so it has become something like gold even though It is suppose to be used as money so its really both 

bitcoin is not a  gold but it is real digital cash

We should treat bitcoin as it is, serving its purpose should be the first and foremost, bitcoin was intended to change how the payment transaction should
be, if this new system will be able to penetrate and be a part of major transactions then more people will be aware that it s really a good alternatives to
the common service that we are using right now, as  also, being an asset is just an options for those who believes that the value will grown much stronger.

I think the purpose of bitcoin is created as a currency, where Bitcoin has more advantages than conventional currency, so I prefer to call bitcoin as digital cash rather than digital gold, although bitcoin can also be used as investment field like gold.

Most users will say they think it's digital gold. But for me it is digital cash because money is a kind of payment and bitcoin should be a currency that's why it is existing. It aims to be a currency not to be a gold.