Welcome! If you look at the thread title above your first post you will now see a little tag that says “afterIris”
Tap on that and you will see the list of discussion threads from other Iris refugees and you should find some of those of interest. 
As far as the ADT model hub versus the V3, see the following thread (the thread title is a clickable link)
Also, I’m not sure what the “Neo” sensors are. Do you have a link? Are they the Neo Coolcam Devices, and if so, which model?
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