How many cameras should I use for an LibGDX game?

I’m setting up a new LibGDX project and trying to use Screen. So I made a few screens (splash screen, menu screen, game screen, etc). Is it better to instantiate one master ortho camera and use that for each screen? Or is it better to have a separate camera for each screen? I have read you could do either one, but is there an advantage to one or the other? This will only be a 2d game. Thanks.