What's the best solution to sync contacts from Mac to Android Phone?
I finally found a solution that I'm happy with:


On my NAS appliance, I installed OwnCloud, which supports contact synchronisation with the CardDAV protocol. OS X support CardDAV out of the box.
On the Android device I installed CardDAV-Sync and Contact Editor Pro (see the OwnCloud doc). Both together cost about $5, but there are free versions that also work well with fewer features. Still much less than $40 for Missinc Sync or SyncMate.


Thus I get the advantages of a cloud solution (immediate updates, two-way sync) and get to keep my contacts private.