There's little reason to buy a Galaxy S20. Samsung doesn't have any proprietary hardware or software that differentiates the device from the rest of the Android market. Right now, Samsung's size gives it the advantage of being one of the first to ship the Snapdragon 865, but if that's something you...
The 120Hz display is wonderful; It's buttery smooth and an improvement over 90Hz; It's just a shame it doesn't run at max resolution.
The sticker shock; The in-screen fingerprint reader is still the same tiny, first-gen sensor that was in the Galaxy S10; The cameras are a mess. Focus is slow and frustrating, and you'll miss shots waiting for it to catch up. The overhyped "100x zoom" is a smeary mess of pixels.