That's a tough decision because you are also used to looking at them everyday without handles.
Most cabinet doors ( not all ) are made to be used either so it comes down to personnel preference.
Here is something to try that might help. Pick out a handle or a knob that you like and purchase 2 of them.
Take them home and hold them on the doors and drawers. Doing this will give you a visual idea of what it will look like.
Good luck and thanks for stopping by.
David : bobvila Moderator