This competition is tough. Each phone has certain areas where its camera does better than the other. Overall, I'd say the Pixel 3 still has the top camera on a smartphone because of its versatility with Night Sight, better zoom, and generally better performance indoors.
Outdoors, however, the $800 to $900 Pixel was somewhat disappointing compared to the $550 OnePlus 6T.
The OnePlus 6T overall is a happy medium between the Pixel 3 and Samsung's phones, which tend to process photos a little too much and makes them look unnatural.