Stag is more elastic (not that surprising as I believe it's like horn, a kind of 'hair'). It can shrink back in dry conditions but it more often than not regains its former shape when humidity rises. I've dropped a couple of stag knives and they've been OK in situations where bone would've chipped or cracked.
I don't really agree that only older bone knives would be prone to pin cracks, two recent GECs have displayed this unpleasant feature. Being shed by the deer in the course of their life unlike other materials where the animal must die before you can use the tusks/bones, is another positive aspect. As others have already pointed out.
Frankly, when stag is great it's the stuff of the gods

:thumbup:
Regards, Will