Hello! Yes, both options can work wonderfully for texture, but they behave a bit differently.
Saltine crackers will give you a texture very close to traditional breadcrumbs because they are dry and absorb moisture well. Just make sure to crush them finely.
Rolled oats also work, but they create a softer texture and might give a slightly nutty flavor. If you use oats, it helps to pulse them in a food processor first so they blend smoothly.