To answer what you asked in the title, there is no answer.
When looking for a safe alternative, it is clear that there is nothing safer than bitcoin because when comparing bitcoin and altcoins, bitcoin is the safest.
The altcoins you listed do have a base that is actually large and still very much loved but when this becomes one of the comparisons that is safer than bitcoin I think the answer is no.
Instead of bothering to look for other alternatives if there is money why not be in bitcoin because this is the most appropriate thing.
Indeed, some people will argue about diseverification but when it is not too sure about the alternative why should it be forced anyway bitcoin is something worthy.