Currently using a Galaxy S21 FE. I'm honestly not rhat picky, as long as it's not apple, and as long as it's fast enough, as my employers have paid for them. I got this one after being on the wrong side of the country while my phone died, so I had the shop clerk phone up the guy at the head office to confirm that I could just pick one and send them the bill. The S21FE was what was in store at the time, and I was kind of in a hurry, as I was in the middle of a projectrelated field work.

I've mostly stuck to Samsung because that's the (mangled) version of Android that I'm used to. It takes some tampering with adb to remove the bloat, but once done it works really well.

The "best" phone (quotes, because I think that's highly subjective) I ever had was the Galaxy Note 2. I loved that phone. Great stylus, good OCR, and once it got used to my terrible handwriting, it was much better and less prone to error than typing on the softkeys. The Note 3 through 6 were not available in my country, so I know nothing. And it annoyed the fuck out of me that Note 7 was a safety hazard, because beyond that it seemed like a really good phone. Sadly the later iterations of the Note series seem too cheaply made. Plastic stylus, etc.

Honorable mention: Openmoko GTK 2. I loved it, but the concept of a linux smartphone (or smartphones in general) hadn't matured completely in 2007, so it wasn't at the stage where it could replace my dumb phone completely.

Today, as mentioned, I'm not that picky. I feel like most phones are the same, except the ones that are too cheap. There is only so much useful hardware that can be crammed into a phone, and beyond that there are mostly improvements on things such as the camera. The rest comes down to software.