I was reading a review of the new 2018 Mac-Mini...and Apple did a great job with the 6-core CPU in the mid & top-end models (great CPU benchmark scores)...but Apple didn't include a really GPU to match the great CPU performance (maybe a cost savings thing...or didn't want a lower cost Mac-Mini to cannibilize iMac sales).
Anyways...using an eGPU was suggested to improve the 2018 Mac-Mini's graphics abilities...but these can get costly ($500). This idea was sort of not necessarilly suggested/recommended...since if you take the purchase price of the 2018 Mac-Mini ($1100+) plus the cost of the eGPU ($500-ish)...might be better off getting something else (such as an iMac with a discrete GPU).
Food for thought.
- Nick