I’m not necessarily a hardcore Milwaukee fan boy, but it would appear like it if you looked at my tools.
I have M18 and M12 just by chance, I was given some M18 stuff many years ago and then it expanded from there. I have a hodgepodge of corded tools from the other brands but all my cordless is red.
I am a pro, so all Fuel grade stuff when available, and I have a million batteries.
Other guys at work have either Milwaukee, Makita, or Dewalt and all seem to be comparable, but if you are a pro user, buy the “high grade” stuff, like Milwaukee Fuel, Dewalt XR, or makitas version of that.
They all are junk but all are pretty good haha.