Down-the-line vs face-on
Two angles cover almost everything. "Face-on" (camera in front of you) shows weight shift, tempo, and contact. "Down-the-line" (camera behind, looking down your target line) shows swing path and plane.
Pick the angle that matches what you want to learn, and keep the camera at about waist height, level, and far enough back that your whole motion fits with room to spare.
Be consistent
Whatever angle you choose, use it again for your retest. A read is only comparable to another read taken the same way. This one habit makes every future comparison trustworthy.