While each mode is unique and important to understand, most of them still provide the basic function of flight-stabilization and assistance tool. For instance, OPTI typically features an Optiflow sensor within the drone, which is a downward facing sensor capable of identifying patterns on the ground and helping the machine to maintain a straight position.
The blade nano qx is the closest competitor to the Hubsan. Both of them are extremely popular for beginners, and both of them are loved by enthusiasts due to their modification capabilities and excellent flight characteristics. Repairs are easy, the motors have plug in connections so you don’t have to even solder if one goes out. The price on this one is a bit steeper than the others, running about $80 for a complete, ready to fly package, but you do get a more capable quadcopter.
Another one of the great drone on this list with the beginner in mind, the UDI 818A HD Drone is electric powered, radio controlled, and equipped with six gyroscopes for stabilization. Although it can take a decent beating, it is recommended that this drone not be flown above asphalt or concrete, as it is still made of plastic, and can break if improperly used.