Depends very much on what you want to do. If you just want to scroll presets up and down then a small, simple switchers will work. If you want to take advantage of the C4’s deep midi capability then a more fully-spec’d controller is in order.
My advice - buy a Morningstar MC6 - they come up used plenty and are astoundingly powerful whilst being really simple and straightforward to understand and program. You can make it do whatever you want from simple to complex.