iPhone, mostly because of family.
I eventually want to jump to Lineage on Pixel, but that’s not an option for me currently.
My Thinkpad has the factory Windows install on its factory-installed drive, but I only booted it once and otherwise never use it. As the laptop has 2 M.2 slots, I just installed a 2 TB SSD in its secondary slot and installed Debian 12 on it right after I opened the box. I nearly always use that install.
I recently had an exam where the spyware test monitoring Chrome extension was mad about me using Linux (I only use Chromium when I have an exam - otherwise I just use Firefox), so I had to use one of the Windows machines in the lab. This was weird, because I’ve taken other tests (including after this incident) that didn’t have a problem.
Back in high school, I had to use a Chromebook and the occasional iMac, though the Chromebook is technically a Linux device.
Autism has little to do with it - I’m on the spectrum and I have “proprietary” Star Trek wallpapers on all my Linux machines - Ent D and DS9 on desktop, DS9 crew on laptop, Cerritos on that one old Chromebook I installed Bcachefs Debian Testing on for fun once, Borg cube on my Surface…
Now my wallpaper choices and overall Star Trek fandom… you could probably make a reasonable guess on where that comes from. 😉