With the clarification from the OP, I would go for the consecutive serial numbers. Can one have enough pre-40 1953 Smiths? And, what are the odds you will ever be able to mate up consecutive numbers again?
If that doesn't float the boat, get it, sell the first one (of lesser condition/no box) and you have upgraded nicely.
It's your call, and now you have several opinions. Do what makes you feel best.