The deign of my system is centered on Node Red. Think of it as my controller. There is a thin line between what Node Red can do and what OpenHab can do. I like OpenHab for its many Bindings it offers and its seamless integration into Node Red. OpenHab has a robust Restful API that someone has developed nodes for within Node Red. This makes it easy to quickly setup a few “Things” in OpenHab, create some items, then quickly pull into Node Red. I went this way some time ago because the Logic Engine within OpenHab felt clunky and complex and Node Red is incredibly easy and has a strong community. The two primary drivers (Bindings) for me using OpenHab is my many Zwave devices and my Ecobee. Past that, everything else occurs in Node Red.
For Ignition I use the node-red-contrib-ignition-nodes to Read and Write to the Ignition tag database. I’m just really getting into using Ignition and still trying to overcome the learning curve.