. . . with two exceptions.
Perpetual calendars are personally preferable without.
With . . .

. . . vs without.

The raison d'être for the perpetual complication is to portray the calendar on the dial; a seconds hand seems unnecessarily intrusive here.
And Flightmasters. mrsnak's 911 . . .

. . . vs my 910.

There are other reasons to prefer the 910, but the employment of a 24 hour sub-dial is the essential one.
Art