I use the folio case made by Samsung for my S7Edge and it's protected the screen really well, so I'm going to do the same as soon as the Orchid colored ones become available for preorder. They are very slim.
On my S7 I just have a Ringke case. That phone survives a rough life in my purse and on rare occasions a jeans pocket. The display glass looks pristine despite that. I don't use protectors because I use the VR headset a lot. I'm not sure how well a screen protector would work out in there. My phones sometimes get very hot.
I did try film protectors a couple of times and I got near perfect applications but they just make the screen look pixelated.