Im sure the op5/5t can produce good pictures as well.
- any phone brand with semi-full Manual Settings (except Aperture) can get good pictures, especially in low light or night/astro photography
- what differentiate among camera phones is the stock Camera Apps used primarily in Normal/Auto Mode, like in Pixel they use Google Camera apps which is great...<click here for link>
- YES both OP5/5T and Huawei 10/10 Pro have full Manual Settings but other than that the Mate series has additional camera mode features on which Oneplus don't have that is very usefull and simple
As for the pro mode/manual settings for photos, you can't always set these things up before the subject goes away.
- depends on what composition you will take photo's, for candid shots it is best to use Auto/Normal Mode
So @zeroflare, besides your preference, are you a Point&Shoot or knowledgeable in Camera Manual Settings?