Mint is a little too pretty for me...Kali and Ubuntu LTS for various tools. The laptops I get for work are expensive, which are outside the discussion here although I do encourage people to get used business class laptops over the commercial crap they see on the shelves; my home desktops just get new systemboard/proc/memory as needed.
As far as windows; I have several licenses for it that I bought cheap on ebay. I have VMs loaded with it as well as dual boot on a few things. I need it for labs, sandboxing, and my stupid tax software. Other than that, I don't do much in it as a user. I can run most windows apps in wine.