Most fun tinkering with: used Lenovo ThinPad T480, on which I swapped out the storage, RAM and wireless network module {1TB, 32GB, WiFi 6e}. I also learned Arch Linux and some C programming on it.
Bringing it with me everywhere and is not my phone: my rooted Samsung Galaxy Tab A9+ and my Deltaco WK90b keyboard, a form factor which they have stopped making, which is bonkers. I bring these two to local coffee shops and libraries and learn coding on Termux.
Having own the longest: my sound mixer Notepad 8fx by Soundcraft, 42 inch 4K Philips TV and Adam A5X studio monitors. The studio monitors, I have had for more than ten years. The mixer and TV, for about seven. This is my media setup for consuming video and audio. I play video on the above mentioned Lenovo laptop, streamed from my Linux ISO torrenting rig and audio I mostly play from my vinyl player. This also used to be me karaoke setup when I still had a Nintendo Switch and when I still was happy.
I’m having a hard time defining “best”, so I’ll put out a few categories: