When choosing the look of your new kitchen, one of your main decision will be whether you are going for a modern or traditional aesthetic. Much of this will be dictated by the units you choose and the doors you put on them. Shiny doors are highly fashionable and can look very stylish and on trend. Matte units tend to be more traditional, though they can also be used in a modern kitchen with great success.
Choose the units that appeal to you in terms of their appearance. You may want to get units that are easy to maintain as well, in which case matte is probably more practical. It can be easy to leave fingerprints on shiny units and you may need to do more cleaning if you select this type of kitchen cabinet door. Look through brochures and see what both options are like in order to make your decision.