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Just for lols I’ll bite: aside from GPU (which I’ve already spec’d as an eGPU) and retina display (which he has) what is materially better on a 2018 MBP than a 2014 Mini? TB3, okay (can he afford any TB3 peripherals?) but apart from that I doubt you or I would notice the processor improvement or the faster SSD bus. I still think they’re great little boxes as a temporary solution and he’ll have a backup machine when he upgrades.
I wouldn't touch a Mac mini with a barge pole in this day and age... its way over priced and out of date. And buying nearly half a decade old tech is crackers talk.