I think it is nearly the same: both indicate plural. I tend to prefer and use 'những' like an english 's' and 'các' like 'all of them/all the'. But it's just my feeling...
Những mean plural?
Can someone explain when to use các vs. Nhung
They are have the same meaning for plural. Just different in very few situations. The most situation, they are still the same. You can use what word you like
No elephants, your grace.