There isn’t one universally “best” option, and many photographers simply skip screen protectors altogether. Camera rear screens are usually less exposed than phone screens, and any extra layer can slightly reduce viewing clarity.

If you do want protection:

• plastic film: cheapest, easy to replace, good light transmission, helps prevent surface scratches. But it scratches easily and offers little impact protection.
• adhesive glass: better scratch and minor bump protection than film, but can reduce screen brightness/clarity more, may shatter on an edge impact, and can be harder to remove because of the adhesive.
• snap-on protectors: generally offer the most physical protection and are removable, but tend to be bulkier and may affect usability or screen appearance depending on the design.

A reasonable rule of thumb:

• If you only want scratch protection, use plastic film.
• If you want more real protection, glass is the better choice.
• If you want maximum removable protection, consider a snap-on type.
• If you prioritize the cleanest viewing experience, use no protector.

Also, some users note that the factory outer screen cover on certain cameras can be replaced relatively easily if it does get damaged.