The answer to, What's the best phone case, will be a subjective answer. You need to include some detail about what you expect from a case and what kind of life you live.
For me the best case is one that has some drop protection. I would say I've never dropped one from more than off my lap.
One that still shows off the natural color of the phone I selected. The S10s come in some nice colors why hide it.
One that works with a screen protector. I'm currently still using the stock one but I want options too.
A case with good reviews for fit, function and protection. Lots of YouTube for this one.
Last but not least, one that won't break me. I mean after all I just spent a bunch on the device I needed to save somewhere.
I found a Ringke crystal clear, name brand, good reviews and the right price. [URL="https://goto.walmart.com/c/1943169/612734/9383?sharedid=159229&subId1=UUacUvbUpU6576677&subId2=vbac&u=https%3A%2F%2Fwww.walmart.com%2Fip%2FGalaxy-S10-Plus-Case-Ringke-FUSION-Transparent-PC-Back-Cover-Anti-Cling-Dot-Matrix-Tech-Lightweight-Shock-Absorbing-TPU-Bumper-Protection-Samsung-Gal%2F359824643%22]$10 at Walmart.com[/URL].
My son on the other hand just got a case for $50, based on hype, IMO. A Mous case that is demonstrated by people throwing them at walls or to the ground and dropping them from cranes. He isn't the most careful person and has been known to accidentally fling his device across a room. It hides the color of his phone but he found a design that he liked and it was what was best to him, for him.