Ask your Realtor to do a cma for your home. Which attributes brought a
higher sales price? In other words, what qualities prompted a buyer to
pay more for the same square footage, bedrooms, baths, etc as others?
Curb appeal brings buyers in, but what qualities make them eager to write an offer in your area? Concentrate your dollars on those things if you are concerned with resale value. My sis lived in NH and at that time we couldn't find basements because of the granite substrate. She bought a colonial, much like
others on the market, except the one she bought had a fenced back yard for her doggie. Your Realtor will
tell you what adds the most value locally.
Of course, this answer presupposes you've already taken care of the other quality of life upgrades.
Curb appeal is critical, but after they've gotten inside the home are they going to say, "Love it!"
In closing, a white picket fence probably won't detract from your value. Will you get your cost of installation
back at sale? Rarely. Ask a local Realtor.