Posting a question like this on this forum is going to result in very biased opinions favoring ISY platform. On the other hand, if posted same pretty much anywhere else, most would probably wonder what Insteon or and EISY is.
Setup HA on a spare computer, install the ISY integration and experiment - it won’t hurt anything to have running separately. Then form your own opinion but only by giving it a fair chance; it may take months of off and on with it. There may be times you get frustrated, so just leave and come back later and go research online, watch videos and tutorials (there are lots of them). You may like it or end up hating it. It took me a while to get the hang of it. I actually had home assistant installed for about a year before I seriously gave it a shot and then something clicked and all made sense to me. It is even easier now than it was two years ago in regards to setup, creating automations, easier dashboards with drag and drop arranging to list a few examples.