I use UAG black.
Fantastic case, very sturdy, grippy, looks cool and feels like it offers good protection against drops at the same time it's not too bulky. A bit expensive at full price.
My second choice would be a simple smoke gel case. Improves grip and handling and offers minimum protection vs scratches
I also have Spigen Neo Hybrid case. Absolute rubbish. Putting aside aesthetics which are subjective. The case is cheaply made and poorly designed (thin and slippery plastic offering little protection, power button gets pressed if you apply pressure next to case's power button, very slippery) . This is my 2nd Spigen case. Both are a joke. Will never waste my money on Spigen products again. Mind boggling why their cases are popular, I presume that Spigen puts marketing and branding over other things.