Electric coffee grinders are quick and easy to use and make grinding espresso particularly easy. Hand grinders on the other hand are slower and demand more work.
But generally speaking a hand grinder that is the same price as an electric grinder will tend to perform better. This is because anything electronic and requires a motor will increase the cost of the final product.

Grind size distribution refers to the range and consistency of particle sizes produced when your coffee is ground. A 'uniform grind size distribution' ensures that all particles are similar in size, leading to an even extraction and cleaner tasting coffee. Variations in grind size distribution can make your coffee taste muddy as some particle are extracting more than others.

Conical burrs offer efficient & low-heat grinding, making them ideal for home use and are commonly found in hand grinders. Flat burrs generally provide a more uniform grind size and are commonly used in electric coffee grinders, flat burrs are favoured by professionals for their precision and consistency particularly when grinding on finer grind sizes.

While some grinders can produce a range of different grind sizes it is important to know that they may not be the best quality of grind size. Depending on what types of coffee you're wanting to make, you may want to consider opting for a 'espresso grinder' or a 'filter grinder' rather than an 'all-rounder coffee grinder'