Which generator is better - synchronous or asynchronous

An electrical generator is an installation that is capable of generating electrical energy. A household generator, as a rule, consists of an electric motor, as well as a block that converts torque into electricity - a generator.
Diesel generators and gas generators are used for work in domestic conditions.
A diesel generator is a generating set that uses a diesel electric motor. This type of generators are used both as an emergency power source and as the main one. Diesel engines have a longer service life than gas generators.
A generator without a generator is a small power plant that uses a gasoline internal combustion engine as the primary electric motor. Gasoline power plants are most often used as an emergency power source. The working resource of the gas generators is designed for 4-12 hours of work. This type of generator will be simply indispensable during short-term power outages.Also, gasoline power plants can be used in places where there is no power at all.

Distinguish between asynchronous and synchronous generators. Which one to choose?
The main advantage of synchronous electric generators is the high stability of the output voltage, their main disadvantage is the possibility of overloading the generator in terms of current (when working with an overestimated load, the regulator can excessively increase the current in the rotor winding). Also, the disadvantages of synchronous generators include the presence of a brush. Sooner or later it will be necessary to service the old one or carry out the electrical installation of a new brush.

Regardless of the change in the speed of the electric motor, as well as the load current of the power plant, the stability of the generator output voltage remains quite high, with fluctuations of ± 1 %.
An induction generator is an induction motor that operates in stop mode. The rotor of this electric motor is in the same direction as the magnetic field of the stator, but slightly ahead of it. An asynchronous electric generator is quite easy to operate and maintain, has a low sensitivity to short circuits and a fairly affordable price. This type of generator is used quite rarely, as it has a number of disadvantages: unreliable operation in extreme conditions, as well as consumption of a magnetizing current of considerable strength.