He's a gamer who doesn't really understand computers and just does what YouTubers tell him to. They say it's fast and he likes that a lot
Tails uses Arch with a Windows dual-boot. He has like 6 or 7 different versions of Firefox at any given time and connects through a VPN he created. His favorite browser is Basilisk. His desktop uses the same case he's been using for 10 years and he just upgrades parts as he sees fit
Amy uses a Mac and iPhone. She thinks no further of this and uses whatever messaging app Tails says to use (currently Signal).
Knuckles has an IBM Thinkpad running XP and a Galaxy S3. He uses them to make phone calls and check the weather on Angel Island. Tails keeps trying to get him off SMS and a 3G cell connection but it never sticks
Shadow's stuff is all "gaming", not because he's a gamer, but because it's all black and he can make the RGB LEDs just be red, and he has no concept of money
Big has a landline