All three models have Gorilla Glass 6 covering the screen, but only the Galaxy S20 Ultra has it on the back as well.
Last year's Galaxy S10 Plus, at least came with a tougher ceramic option, but this year you have no choice but to go with glass. But they still have the same curved glass design, which has proven to be the Achilles' heel of predecessors when it comes to weathering drops. Samsung's new Galaxy S20 phones have better cameras, new colors and an even bigger screen option, thanks to that 6.9-inch Galaxy S20 Ultra.