Will Cyanogen 13 update to Lineage 14 and preserve apps, data etc? I have an S5 with TouchWiz (i.e. standard rom) I want to change, but I don't want to have to wipe and reinstall everything twice over.

There is a stable Cyanogen 13, and an experimental lineage 14, for my device. I don't want to install an experimental build.

If I install Cyan 13, will it be able to update to Lineage 14 when it becomes stable, without me having to reinstall everything? Or should I just wait till Lineage 14 becomes stable?
If you install CyanogenMod 13 then you cannot install lineage OS 14 without wiping the device.
If you install CyanogenMod 14 then you can directly install Linage OS 14 without wiping the device, but it is not guaranteed.
If you install CyanogenMod 13 then you may install Lineage OS 13 without wiping the device, but it is not guaranteed.

Lineage OS web site as more clarification.

http://lineageos.org/Update-and-Build-Prep/