S9 has better display tech, but the G7 is a far superior overall display experience for one gigantic reason. It's flat.
The edge display is one of the worst blunders in the history of mobile phones. A screen that bends away from you makes zero sense. Zero. Glare on each edge, text and graphics are distorted on each edge on many websites, usable screen space is very narrow, hard to pick up and even harder to protect properly. It's a collosal design flaw.
I have the S9, just ordered the G7. As for the camera. That's purely subjective. G7 has a wide angle, which in my experience, is far more practical than 1000fps slow mo etc.
In my book, G7 is the far better phone. Notch or not. I hope Sammy goes back to a flat display option for their flagships. Until they do, they will always be a step behind with regards to display.