The HA switches will cost significantly more than controller, so IMHO you will have to first like the switches. It really comes down to what kind of HA switches match your personal preference and integrate well with current system (i.e., don't constantly require babysitting and intense troubleshooting).
If you are using a VRC0P/VRUSB to control a few non-Leviton devices, you could probably use a Vera. You’re basically paying for the tight integration with entire selection of Leviton load controllers. I just added a four button scene controller last month, and RF Installer Toolkit was able to help setup all the scenes and associations.
For an Omni system, you might be better using HAI switches. If you require lock support, maybe Zigbee locks are a better alternative for HAI.