I think it depends on the altcoin or project you are planning to invest but if you were talking about other altcoins under the top 10 coins they are not risky to invest.
Please permit me to say that all coin are risky but it all depends on how much risk you’re willing to take that’s why it is always advisable to invest only amount you can afford to lose.
Bitcoin itself isn’t even a safe haven for everyone that is why it is always advised that people should do their own personal research before jumping on any project even bitcoin inclusive so you wouldn’t have to blame anyone for any shortcomings that’s if there be one.
@op, I don’t know why you are seeking to get wanting to compare bitcoin and other coin and if maybe you’re trying to diversify to make mic more profit then you should also be prepared to make much more losses if anything goes wrong.
Over the years, bitcoin has proven itself that it has come to stay, and I don’t see it going anytime soon
Invest in bitcoin if you can but always do your own research (DYOR)