Griffin Survivor Clear ($20)
Another excellent case manufacturer that's been around for years is Griffin. They're one of the #1 smartphone case makers, who got popular from their early iPhone protection. However, Griffin still makes great cases for every big phone, including the Galaxy S9.
The Griffin Survivor Clear is their most popular case, the Survivor line, but with a completely clear finish. This way you'll get total protection without covering up the premium design of your new Galaxy phone.
They claim these cases meet military-grade specs and will survive a drop from around 4ft, which is pretty decent. Get the Griffin in clear or a wide array of different colors.