Have a Note 9 on pre-order but received a OnePlus 6 from work yesterday.
After only using the phone for a few hours I'm keeping this as my main phone and will give the Note 9 to the wife.
I have mostly owned Galaxy Notes with the odd Xperia. What I love about setting up the OP6 is the lack of duplicate apps. There are only Google apps with a couple OnePlus apps which can be unistalled.
Setting up the Xperia and Galaxy was always confusing as you have to decide which app to make the default for almost every task and the ones you know you'll never use can't be removed. So you need to use a 3rd party launcher to hide apps on the app draw or disable.
I don't take many pics and never found a use for the S-pen. Just wanted a large Amoled display with good performance and for that the OP6 is the perfect device for me.