Hello, i am an experienced drone pilot and i did many 3D reconstruction projects using drone, check my projects on sketchfab.
The best drone should carry a mirrorless camera, i use Sony A6000 with fixed focal lens, to minimize the distorsions and exclude the possibility of changing the focal length during the flight. I prefer 16 mm or 30 mm.
So 1Kg of payload (camera + gimball) should not overload your UAV platform, engines should work at about 50%to 60%.
Because you need at least 20% spare power for platform stabilisation, even when your battery is empty! Some times you fly on high grounds, above 1000m and the engines has less efficiency. Some times you get into downdrafts, or some times you have high winds.
That power request excludes almost all comercial drones.
Also an UAV who empties your battery in les than 20 minute, will destroy your battery in less than 50 flights. So chose drones who fly with 1Kg of payload for more than 20 minutes or else you'll have problems with your batteries heating and puff-ing.
A good practice would be having an good autopilot with auto grid pattern generation, like mission planner. Telemetry is a very useful bonus, helping you to exactly appreciate the distances to your objectiv.
I found out that FAE Drones sell the right kind of drones for 3D mapping at very good price for the performance range they offer. FAE sells the entire solution, including flight training and all accessories. You need your own camera and you are ready to go.
Here is the drone for 3D maping link:http://fae-drones.com/en/aerial-survey-drone-package/36-complete-aerial-photogrammetry-drone-kit.html