The Holy Stone HS100 is another budget-friendly autopilot drone. It has one of the shorter flight times at 15 minutes but is still equipped with headless mode, altitude hold, and one-touch takeoff and landing. This would be a good drone for beginner pilots who are just learning. It has a built-in 1080p, first-person view camera that can capture some great footage. Again, there aren’t as many advanced camera features like the more professional drones have, but the Holy Stone HS100 still makes for a great flight experience.
HD video starts at the resolution of 1080p as a minimum. For all of these drones, the video is captured at the lower resolution of 720p, even when they claim to have HD cameras. The resolution of still images is always higher than the video. With still photos, the resolution can be as low as 1 megapixel (equal to 1000p) and that resolution is considered HD for still photos. 
On the other hand, ATTI is a partially different tool, whereby the quadcopter uses other techniques and not necessarily external sensors to firmly hold the drone in correct altitude and orientation. ATTI allows the drone to hover in place, as well as to gently drift around while being pushed by the wind. Some drones also have GPS which offers great precision and coordination during flight.
This FPV drone focuses more on the actual drone than it does the camera aspects, however, considering you get more features and capabilities. You can use a FPV real time HD live transmission with your mobile device using the FPV WiFi feature, have Headless mode, a low voltage alarm, 360-degree flips, and gravity induction that allows you to fly at all angles and in every direction.
A flight time of 15 minutes or more makes the DROCON Bugs 3 a very attractive proposition. It's not the easiest to learn, but once you've got the hang of it, performance is excellent. So why isn't it in our best five? It's designed to carry GoPro action cameras (or similar). If you've got one, it's worth the investment. If you haven't, it's an expensive toy.
The quadcopter is only about 3.5’’ measured diagonally motor to motor making it one of the smallest drones on the market. Even in that small chassis, Cheerson managed to fit a 100mah battery. While that may not sound impressive, it delivers solid flight time, keeping you in the air for somewhere between 4 and 8 minutes depending on how hard you fly it.

For example, OPTI has a built-in Optiflow Sensor (a downward facing sensor), which functions by picking out the patterns on the ground to ensure that the drone maintains a straight position.  ATTI, conversely, works a bit differently. With the ATTI, the drone employs other techniques apart from the external sensors to keep the drone in the right orientation and altitude. Thus, the drone can hover in place, or drift slightly around with the wind serving as a push. You will also find a GPS in some drones, and they help the drone to maintain coordinated and precise flights and landings.
The Altair AA108 is durably built and will not break easily. You can count on a solid flight time of around 10 minutes, a bit less when you’re running it FPV. However the 720p camera really works well and connects to your phone through WiFi. It’s easy to fly because it has 3 flight modes, 1 beginner, 2 intermediate and 3 advanced mode. It also has Altitude Hold which allows you to take your thumb off the control and the drone holds it’s own altitude, making it very stable because it’s not bouncing up and down as you try to maintain altitude!