I will recommend you Huawei P20. It might come with a 5.7-inch IPS LCD display which has a screen resolution of 1,440 x 2,560 pixels powered by two Quad-Core Cortex A53 processors (2.4GHz + 1.8GHz) aided by an 8GB of RAM. The expected camera setup at the back might be 16MP + 16MP. With an onboard memory of 128GB, Huawei P20 will be a good choice.
It is a tough competition between these two phones, one side Vivo V9 Youth has a bigger screen and better battery backup but on the other side Honor P20 Lite has a better processor, larger storage, and better selfie camera.
So in my opinion, you should go for Honor P20 Lite.