Why about sleep timers default in windows is usleep and Linux is host ?

Hello.
All good with you ?
The "sleep timers" are the same meaning as the PC X86 TSC ?
I see the default setting for windows is usleep and in Linux is host.
Linux build not run with good thread performance if selecting usleep ? Why ?
"All Timers" is an mix of "usleep" and "host" ? Not is better option ? Have issues ?

Thanks for reading my topic.