There are multiple uses for the Pi. The mini PC is good are being computer, which Pi really isn't good at. But the mini PC can't do the other uses. For example

There are multiple uses for the Pi. The mini PC is good are being computer, which Pi really isn't good at. But the mini PC can't do the other uses. For example, the mini PC doesn't run on PoE. It won't fit in enclosure and can't put it on pole outside. But that is what I'm planning to do with Pi for ADS-B receiver. The mini PC doesn't have PPS support or ability to install GPS receiver. That is what I need for Stratum 1 time server. A lot of things I want to do just need USB. The question is if one PC or multiple Pis is better. I like idea of Pi per task since are independent units.