The best choice is to get the aforementioned Capto or CleanShot X apps for both jobs. Unlike QuickTime, Capto lets you record screen activity, webcam video, computer audio, and voiceover all at the same time, as well as choose between recording a portion of your screen or the entire display. CleanShot X has tons of useful settings — for instance, you can highlight mouse clicks, set the app to display recording time, and disable notifs while recording.