honest i dont notice much of a differences to me.
the 9 is the lighter but not by much that i notice.
(i can judge it by my GF she has week wrest and she can shoot the 9 more then the 40 in the xdsc models)
we where talking about recoil the other day and none of my guns i notice the recoil much (starts about the 45 and 10mm) until i get up to the 44 and 50ae then i take notice
just found this deal o a xd9 and a xdsc40 $399+15 to ship if you ffl does not rip you off it is not a bad price i just sold a xd45acp 4" local for $450 used