Same diff as between "who have eaten" and "who ate" - or as between "who have attempted" and "who attempted."
You choose one over the other depending upon the given context and the given intention.
E.g., in certain cases / contexts, it might even be "more appropriate" to write "who had died." (Plusquamperfect)
That's the best I can say without resorting to all kinds of grammatical terminology which might only further confuse you.
Regards,
>> which might only further confuse you.
Be generous and confuse me.
>> Same diff as between “who have eaten” and “who ate” - or as between “who have attempted” and “who attempted.”
And those are not two equal analogies — the first is structurally different, that latter is simply a substitution of terms.
“plusquamperfect”
you made that up, didnt you ?
Now if you could explain how to use “:” vs “;”