Hmm GG, there's something I don't know and I've never asked... and you just reminded me of that!
Edited: Sorry, I'm dumb, I was not sure of "which" but I checked in the dictionary and I saw it's ok.
![Smile [:)]](/emoticons/emotion-1.gif)
Looking at those examples:
Situation one:
Of all the nice young ladies we just met, which would be good candidates to join our Tea and Cupcake Society? I wasn't sure I could say this, but it's ok. Yep.
Of all the nice young ladies we just met, who would be good candidates to join our Tea and Cupcake Society? Yep.
Of all the nice young ladies we just met, whom did you consider good candidates to join our Tea and Cupcake Society? I think so, but very formal.
Situation two (and all of these can be left out)
They were all nice young lades, at least, all the ones that I talked to. Yep
They were all nice young lades, at least, all the ones whom I talked to. I think so, but very formal
They were all nice young lades, at least, all the ones which I talked to. Nope
They were all nice young lades, at least, all the ones who I talked to. Yep