i have an old motorola Moto G Gen1 (2014 & 169€) good price-performance ratio and still a good device.
+ Alldocube (Cube) T12 - 10 Zoll Android 6 Tablet (2017 & 86€) best price-performance ratio
I have the Pixel 2 with Android 8.1...and this nice AR stuff in my camera...yesterday we measured with Ground Penetrating Radar, and I've put all this Star Wars people into our documentation video. Our customer now thinks: wow so many stuff members in this company...I have to pay them more money
I try to stick with three or four year old technology. I buy refurbished or used-like-new. I have always had very good luck.
My current favorite is an LG G4 that I got for about $130. I love the buttons-in-the-back.
I just got an iPhone 6+ refurbished - just to have an Apple. This is the most expensive phone I have ever bought at about $240. It arrived in pristine condition.
my personal Smarphone:
Samsung Galaxy S3,
I really love my Samsung staying with me over 4years..trying to update the android version I almot killed it but still alive now.
yes, I have to buy a new Samsung S7-8 for sure.