What did you decide to do? What did your Realtor tell you to do?
Maybe your Realtor does not have any knowledge of pools.. ? (like below) But, again, Yes, resurface it will sne dthe signal to potential buyers taht you maintain your home and you care for your property.. If I were to walk into a home as a buyer.. and noticed the pool needs to be resurfaced I would feel that you were leaving me a headache.. did not care about your home and could care less about who was moving in.
You need to think of the buyers mindset also, think about moving (which you will be doing) and the unpacking, painting, and all that stuff... now put the pool re surfacing on top of it.
Now think about the same situation and the new homeowener can break his butt all day doing that stuff.. but at least he can suit down and admire his nicely maintained pool.
Resurface the pool.