Full on condom for my phone.
For my S4 I had glass, for my S8, 1+ and Pixel I had a matte screen tpu protector. Now my newest pixel has glass again.
Case: Always.
And every phone and tablet I owned from my one plus onwards, I had a vinyl skin on the body.
The phone came out basically mint when I was replacing it.
My P10 Pro has a regular glass protector, vinyl skin on the back/sides and a hard plastic case.
I thought about a privacy glass but ultimately didnt care enough for it.