Oh, buddy, you're going to earn a lot of demerits for this comparison! Happily you provide fantastic insight on this forum so you'll probably survive!
This is obviously not a comparison between the MINI and ANY Miata, but it also shouldn't be any comparison. Stepping out of my m240i in the MINI parking lot to try out the SE, I was totally impressed. I've only ever been in a Miata as a passenger during a BMW CCA autocross, and Miatas routinely beat Bimmers on the short circuit. They also only have 2 seats and even smaller boot, and weigh the same as my cat. This would be like our F14 buddy saying "yeah, the MINI is fun, but it doesn't pull negative G's like my Tomcat." I didn't search, but pretty sure that wasn't said.
Fair comparisons need to be made. Looking at similar pricing (so that excludes Teslas, the i4, etc), size (of course if you need lots of room this isn't it), the models in comparison pale in fun and styling. If you need max range, then the MINI is in a group by itself, and I'm just fine with enjoying what it offers. Tomorrow. When I pick it up.
Cheers!