My company-issued laptop is a Dell Latitude 7480 with Windows 10. I’m due for a replacement this year. I would love a T-series ThinkPad, but my day job only issues developers a choice between HP or Dell. 
My personal desktop (imaginos) is a refurbed Lenovo ThinkCentre M92P. I maxed out the RAM, added a 1TB SSD as my primary drive, and demoted the original 2TB drive to backup duty.
My personal laptop (desdinova) is a refurbished ThinkPad T60. I maxed out the RAM and replaced the original 160GB hard drive with a 1TB SSD.
Both of my machines run Slackware 14.2 with the latest patches. I build additional packages from slackbuilds.org on imaginos and copy them to desdinova. I use Unison to sync files.