Hoping to find a job in the STEM field? Check out these high-ranking cities: https://www.collegeconfidential.com/articles/where-to-find-stem-related-jobs/
A biologist and a computer scientist are unlikely to be looking for the same jobs, and may not find the jobs that they are looking for in the same locations.
They should probably take the “S” out of STEM. Perhaps the “M” too. 
How is quality of life determined?
https://■■■■■■■■■■■■■/edu/best-worst-metro-areas-for-stem-professionals/9200/#methodology
I suppose you then have to track down Wallethub’s methodology for each of those last 3 rankings some of which are pretty dubious, IMO.
But here’s one: https://■■■■■■■■■■■■■/edu/best-worst-cities-for-recreation/5144/#methodology