Perhaps, but I don't think by much.
As you know, the Verizon 5S can fully support Verizon/AT&T/T-Mobile just fine, making it the most universal. Though, I don't think most people will be switching from a (CDMA) carrier like Verizon to a (GSM) carrier like AT&T/T-Mobile often, if at all.
So in a way, I think the resale value will be similar to what past Verizon iPhones vs past GSM (unlocked) devices sold for.
If you're looking for an unlocked 5S, you're not going to care whether it can support Verizon or not. So you won't pay significantly (+10%) more for it.