I had to buy new cases for two new phones and after a lot of looking, I ended up buying Spigen.
Apart from generic, we've used Speck, Ringke and Casemate and been happy, but I'm impressed with Spigens quality, wide assortment, fit, feel and slimness.
I think there was one a while back specifically for a particular Samsung model that had an integrated touch keyboard that communicated via NFC instead of bluetooth or a wire. That's probably the only one that's caught my attention in years (edit: unfortunately, by the time it happened, I would no longer have seriously considered a Samsung). I used to use the cheap snap-on plastic shells, and there was a floppy rubbery one for the Nokia n900 that I thought had handled the slider in a kind of impressive way.
Spigen has been our go-to brand for years whenever we've needed phone cases. In our experience, they really protect well from accidental drops and they never wear out.
Don't like that one.........
Or, if one already has a good phone case..... there's this option @ only $2 each.
