Another factor to account for when getting an under counter fridge is where and how it'll be placed. It needs enough space for the venting system to function and a power outlet. Its capacity is also important, you'll want to get as much space as you can when it comes to refrigerators, especially commercial ones since they are always optimized to cool everything to the same temperature.
Commercial fridges usually come with digital controls for the temperature within, making them very suitable for storing any type of ingredient in accordance with their optimal temperature.
While you can separately get an under counter fridge and freezer some fridges come with freezer compartments where you can store any ingredient that you want freeze until needed (granted that it fits within the compartment). And defrosting the commercial units of under counter fridges is much simpler than any residential variants, since some fridges even have the function of self defrosting. But the most important part of these types of refrigerators is that they allow you to make better use of the space in your kitchen, also removing some of the obstacles that the chefs have to go around in the process.
Since there are usually people going in and out of a kitchen at all times during work hours the effective management of space needs to be as compact as possible to give enough room so that the employees have the space to move from one dish to the other.