Assuming all the properties are of equal size and price, I'd prefer #1. It may have less privacy now, but it's pretty easy to get fast-growing N-fixing trees/shrubs (Black Locust, autumn olive) or tall grasses (bamboo, elephant grass) for privacy (and of course there are slower-growing, more easily-managed options too). The flat land may mean you have less erosion and better soil, as opposed to land with steep hills. And the flatness may also make it easier to move machinery and build ponds.
You will not have the timber/firewood from #2, but it may be easier to establish annual crops, pasture animals, and set up infrastructure. My own land is sort of like your #2, and while the firewood is nice, its hilly and taking forever to seed and transition over to savanah from forest ecosystem.
It sounds like #3 may have all its soil eroded from the hilly terrain and clearcut; hence no new growth.