A countertop microwave eats up valuable work space.
In build around cabinetry there will be be gaps between the microwave and the cabinetry, which will not result in the flush look of a fully integrated, custom unit.
A microwave fully integrated into the cabinetry offers a custom look.
The more tightly the microwave fits into the space, the more streamlined it looks.
Group your microwave with other appliances:
It makes sense to have cooking appliances in the same location, so group the microwave with a wall oven or other appliances.
Selecting a trim kit that matches the appliances helps the microwave blend in.
Since you're already using the wall for appliances, no additional countertop space is wasted.
EuroTrim trim kits also enable built-in models to be fitted into existing cabinet openings that may not be perfectly matched to the microwave dimensions.
The final determining factor may come down to the look of the trim kit:
Do you like it and does it work with your other appliances?
EuroTrim kits match literally every manufacturers appliances