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From [1] I get that PHK decided not to use privilege separation because it's not portable enough. AFAIK that's one of the main differences between OpenNTPD and Ntimed. Well, that and precision of course. OpenNTPDs accuracy is "only" around milliseconds [2] (which is probably good enough for anyone not using dedicated time hardware like a stratum server). The portable version missed the frequency adjustment code for years, but recently this has been added to the portable version as well.

I've also read a discussion with PHK somewhere that he didn't like OpenNTPD because it had no auth (sorry, can't find the source again). I guess this complaint has been mitigated recently now that TLS auth is supported in OpenNTPD [3].

/edit: not sure if it's clear but I was comparing OpenNTPD to Ntimed. But the named differences still exist when compared to ntp4.

[1] http://phk.freebsd.dk/_downloads/FOSDEM_2015.pdf page 13 and 14

[2] http://www.bsdnow.tv/episodes/2015_02_11-time_for_a_change at 30:30 and 34:00

[3] http://undeadly.org/cgi?action=article&sid=20150210103656

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> I've also read a discussion with PHK somewhere that he didn't like OpenNTPD > because it had no auth (sorry, can't find the source again). I guess this > complaint has been mitigated recently now that TLS auth is supported in > OpenNTPD [3].