Lots of threads dedicated to this quandary, and I myself was in the same boat until I opted for the 2019. But I just learned something that may help some make the choice: if you want hands-free “Hey Siri” voice control of Siri on your Mac, you will need an iMac Pro instead of the 2019. It seems that this feature is only available on T2 Macs. Now, I realize that this is a VERY minor feature for most and that it’s still available on every iOS device, but since most of my world is voice-controlled through Echo devices throughout my house, I might have chosen the iMac Pro just for this feature. It was that close of a decision.