One note of caution in this discussion is not to put off the newcomer to POP Pt. Ziatype is imensely flexible and will reward almost immeditly. DOP is a much steeper curve in some respects, if not all.
If you can get a darkroom running at >65% RH then you can relatively easily produce consistent Ziatypes if your careful and consistent with your drying. Soaking in an RH chamber is also a good way to buffer papers during a printing session to get consistency.
DOP is undoubtedly more consistent but I do enjoy Ziatypes .........