Here are the few I've gotten so far
Tech21 Its nice looking, but its sort of meh seems like protection wise. Feels a little thinner than the one I had on my 11 Pro Max and Note 10, so it may end up getting returned, looks like theres complaints for the S20 Ultra due to no protection around the camera. For those who hold the bottom of the phone with the pinky finger its a little sharp
ArmadilloTek case: Its awesome! Very good protection adds a little bulk but not to much, very comfortable in the hand and very nice looking. This will most likely be my main case.
Poetic Affinity: Very awesome feeling case, comfortable in the hand, minimum bulk but feels like it has some okay drop protection. Very great clear case.