Building and Repair
Regardless of what the ads tell you, drones crash all the time. A fantastic drone will require a planned and descent interface in stride, without damaging the framework. It is going to also incorporate shields to guard the rotors and electronic equipment from injury.
Regardless, things get broken occasionally, especially racing drones. A fantastic model will supply a ready source of inexpensive parts like rotors and struts to replace the broken ones and also will make it simple to swap out these parts when required. From this link, you can find more information about the drone buying guide. The exact same holds true of batteries.
Batteries 
Not many drones provide over 20-30 minutes of battery life, therefore a readily swapped battery may provide you longer flying time without difficulty. This has a tendency to be a characteristic of more expensive versions, using a spare battery generally costing over $100.
Camera
Want to display your aerial loopholes? A camera, possibly add-on or built-in, can catch those stunning views for posterity. The top drones will have cameras that can capture video at resolutions of 4K or greater, but even funding models are becoming better, able to capture video in 720p.
But, they are inclined to utilize smaller image detectors, so the quality will not be that good. Some drones also offer you a first-person perspective (FPV), sending a pilot's eye view in the drone to a telephone or tablet computer. Some models provide video goggles for its greatest pilot-seat flying experience.
So always keep these things in mind that will help you get a drone that will fulfill all of your requirements.