Tale of the tape:
iMac 3.1Ghz, 6 core, i5, Radion 575x, 512 SSD, 8GB
Geekbench single/multicore: 1073, 5110
EUR 2759
Mini 3.2Ghz, 6 core, i7, Intel UHD Graphics 630, 512 SSD, 8GB
1138, 5715
EUR 1749
...you gotta really want the GPU and the screen for that grand!
I'm not so sure I do... money...