I have multiple answers, since I routinely use multiple machines:

- Primary desktop (custom-built): NixOS + Windows 11 (latter currently unbootable because installing NixOS nuked Windows' UEFI; whoops lmao)

- Primary laptop (Framework 16): Aeon (immutable openSUSE variant) + Windows 11 LTSC

- Secondary laptop (Framework 13): OpenBSD-current (+ occasional Windows, Haiku, NixOS by booting from Framework expansion cards)

- Band room recording laptop (Dell G5 15): AV Linux