I have traded in forex or fiat for seven years and to some extent, it is stable than cryptocurrency except you have to be highly intelligent and knowledgeable in the things that affect both the country of the currencies you are trading. Forex or fiat trading has a large market that run in trillion of dollars and comparing it with the market (cryptocurrency market) that is just around $300,000,000,000 will not add up in terms of volatile and stability. Bitcoin trading has given more profits than fiat trading but it is a very highly risky market.
Cryptocurrency market might be volatile, but that is actually what makes it more profitable than Forex trading, without margin trade in Forex trading, there is no way you can make much profit because of its stability which does not give room to much profit, so far we can manage the volatility of cryptocurrency trading, I think it is still the best way to make money.
The only thing with cryptocurrency trading is that it is usually not for newbies, because not many newbies knows how to deal with its volatility, so for a newbie, the best would be for them to trade fiat, and if they have to go intro cryptocurrency trading, then they should just join the grow up of long term investors, whereby they buy some of these top cryptocurrency, and then wait till it increases to sell.