Double-sided case or bulletproof glass and normal case?

Un
- in P series
1

I want to buy the Huawei p20 Lite.

But I do not know if I should take a double-sided case or bulletproof glass with a normal case

Tr

Mh. So I think I'd rather take a Panzerfolie and a good case, which is perhaps extra strengthened, or which is a bit thicker.