I like OS/2 and Windows 9x.
Windows XP Professional
In terms of desktop os, probably BeOS.
In terms of mobile os, (Palm's) WebOS – It had so much potential and was essentially half a decade ahead of its time in UX.
Windows 10 :D
xp / openbsd or slackware
Got a Pinephone. WebOS kind of sucks. Ahead of its time, sure, but so was Unity8 with its gesture controls. Without polish and maintinence, y'know.
Every OS sucks but GNU/Linuxes are less awful.
Is GNU/Linux even worth it now that Linus is gone?
>Is GNU/Linux even worth it now that Linus is gone?
Huh? Isn't he still leading the project?