First, you’ll want to do a thorough count of all your doors and drawers to make sure you know exactly how many new pulls and knobs you’ll need. To streamline the project, match your new hardware’s spread to the distance between the existing screw holes (you may need a tape measure). Or you can just take one of the old pulls with you to the store to shop.
Cup pulls are a nice complement to Shaker-style cabinets, particularly in a country-style kitchen. Recessed hardware can make for a particularly elegant and modern look, but also tends to be a bit on the pricey side. Slim, modern finger pull type hardware, which mounts to the top of a drawer or the edge of a cabinet, is a nice choice for flat-front cabinets in a modern kitchen.
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.