I'm a bit of a case whore (own 7) and these two are my favs:

Spigen most recommend, thin, adequate protection https://www.amazon.com/gp/product/B072N3WT4J/

Ownest - hard shell, padded corners, a bit more protection, a bit thicker, I have 2 diff colors I liked these so much: https://www.amazon.com/gp/product/B07DFMDLMZ/

I bought this one,

https://smile.amazon.com/gp/product/B072N3WT4J/

and really like it so far.

I've been using this case since I got the phone, pretty minimal but has protected it from a few drops.

https://www.amazon.com/gp/product/B072N3WT4J/ref=oh_aui_detailpage_o02_s00?ie=UTF8&psc=1

+1 for the Spigen