There are a couple of ways to go about choosing the right color and finish. One school of thought advises you to choose based on the color and finish of the kitchen’s faucet. Given that most faucets are either silver or brass in color, this advice can be limiting, especially if you have your eye on stone knobs or another finish that is not common in faucet design.
Generally speaking, I like to see a combination of knobs and handles/pulls. Knobs or handles for the doors and handles or pulls for the drawers. If you are painting your kitchen, the extra holes can be filled, sanded, and smoothed prior to painting so you can start with a clean slate and choose any hardware for your update. I say “generally speaking” because lately I’m drawn to kitchens that have all handles like this “before” photo of a kitchen we recently updated.