For when I'm working and playing at home.
Ideation and general use
This is usually where my process for any project begins. I want to relax while exposing myself to as few distractions as I can.
For this, I use a Lenovo ThinkPad T460s Ultrabook laptop with Ubuntu Server, i3wm, and MATE Terminal installed. It has a fantastic keyboard and a decent battery life. I bought mine used and can get up to ~6 hours on a 68% charge. It runs totally silent under normal loads.
Projects materialize at this station. I'm able to get into a "flow" and often utilize the resources of a more powerful machine.
I've had the same custom built PC since 2010 with its legacy i7 3.06 GHz CPU and 12GB of ram. It has a full ATX motherboard with a big, noisy case, but it never overheats and is great for when more hard drives are needed.
Media and entertainment
Like most people, I'm at risk of spending entire afternoons and evenings watching movies and shows. To mitigate this urge, I've designated my Acer Chromebook 14 for all my streaming. It's deliberately small so that I don't get too attached to watching it.
I'm probably underutilizing this $300 laptop, since it has the best battery life I've seen in a computer, but it streams great and doesn't have suffer from screen-tearing like my other linux installations do.