I believe the same comments apply in either case. AFAIK, the only difference is that later printings contain an addendum, but it (addendum) can be had seperately and most booksellers will include it at no cost.
I don't think HWS has reached the status of some of the collectable books where a first printing will bring a high premium. That goes for autographed copies also. Only the more serious collectors put any kind of value on the signatures of H, W, or S, since they are still alive and known personally by most of us.