I have used both ZigBee and Z-wave Yale and Alfred Z-Wave locks. As mentioned, reliable locks is a great app, but the most important factor is the strength of your mesh network in either case.
I would definitely recommend the Alfred over Yale if using a C-7 hub as it has the 700 series Z-wave module which will perform much better than the older module used by Yale. I believe kwikset also offers a model using the 700 series Z-wave module as does Ultra-Loq.
Again, make sure you have a repeater close to your locks for best performance in either case.
Best of luck.
