I've owned every Pixel phone out and this is my first OnePlus device. Honestly, I'd say that OnePlus knocked the stock android experience out of the park. It's as smooth as my Pixel 3 XL, but with 8gb of RAM, there is no stutter or delay. Even when having multiple apps open in the background, then opening the camera to snap a quick photo. I've had my Pixel 3XL straight up take around 8 to 12 seconds to open up the camera app when I attempted to either take a photo or record a video. One time, I had actually started recording a video of a friends surprise birthday party and the video was around 20 seconds in when the camera app just decided to closed out completely, while I was recording, and when I opened it back up, it never saved the video. Needless to say I was pissed. The the overall OS is better than the Pixel. You have native screen recording, scrolling screenshot (something Google claimed could not be implemented in Android Q so it would be put in Android R), and extreme customization options. Honestly the ONLY things that I miss from my Pixel 3 XL are the camera, the smart replies, and the dark themed Google App on the left home screen. the camera alone, is the reason why I keep my P3XL in my work bag. Also, since my OnePlus is the T-Mobile variant, I even have "Chat" functionality in the stock messages app, something that I'm still waiting for to roll out to my Pixel device.