Well that's a question with thousands of variables. Everybody I've talked to about land purchasing has a different idea of what they think is preferred land and location.
In my own case, I looked for a location where I could produce food year around and where I could survive comfortably if the economy tanked. We rejected hundreds of locations before we settled where we are now. But I have learned that most people wouldn't be happy living in our location. So even though we are totally satisfied with our choice, other people would not.
Any suggestion I'd make about where to buy land would be biased to our own personal preferences. But when we were looking around we looked into a number of factors......
access & road maintenance, taxes,
local crime rate, the neighbors and neighborhood, local businesses, county and state regulations,
water availability, land use restrictions, retail opportunities for our surplus, weather patterns, costs for building and land grading, permit requirements, future land use plans for the area, medical care access, and tons more.
We looked for a while before settling upon our current region. Then it took a bit more time to find the piece of land we wanted and could afford. Even then, the first piece turned out not quite right. So we sold that and bought a different piece five miles up the road. It's now our present homestead.