> What I also don’t get: why the hell would do I care which NTP implementation is used in most cases. What I do care about is that it’s running and working. Yo

> What I also don’t get: why the hell would do I care which NTP implementation is used in most cases. What I do care about is that it’s running and working. You should care whether it's SNTP (which only slews and/or steps the clock periodically) or full NTP (which also adjusts the clock frequency, so once it's synchronized, no further slew and/or step is needed). Full NTP is better. Looking quickly at the manual pages for systemd-timesyncd and systemd-timedated, I can see that systemd-timesyncd is just SNTP, so a full NTP implementation like chrony or ntpsec should be preferred. From what I can see, if you have chrony installed and configured correctly, systemd's "timedatectl set-ntp true" (enable NTP) will prefer to enable chrony instead of systemd-timesyncd (it goes through systemd-timedated which looks at /usr/lib/systemd/ntp-units.d/, where chrony is usually listed first). (Also, there's some difference between chrony and ntpsec; AFAIK, chrony is much better when you have an intermittent network connection.)