I'm using a trusty Samsung Note 9! It's definitely showing it's age but it remains sturdy enough for me to use. Really not liking the performance drops, especially in rhythm games and my keyboard where inputs suddenly don't get registered.
Before this phone, I had a Note 5 that was traded in for this phone. In some ways I miss the home button but in others the new pen features are quite nice.
As you can probably tell, nothing has moved me to do another upgrade but it's really tempting. Like the performance drops are quite bad but I think I just need to reset my phone.
I have a portable touchscreen monitor exclusively for emergency monitor space and rhythm games. Paired with my Linux laptop it's been pleasant, especially with some tools to sync my notifications and messages in any network.
I find the S Pen really nice for jotting notes in a pinch or doing math equations so for me it would be another Samsung Note phone. However, it's been hard to upgrade because I will mainly miss three things:
Pressure based home button, can't believe this feature got dropped
Iris scanning, for when I can't touch the phone
Headphone jack, for all my friends' cars that don't have Bluetooth or doesn't work well
Some things like MST can be found in things like the Gear S3 (yep still have that) and the drop down notification can just be a gesture but really hard to justify another phone when Samsung is going anti repair and removing features...