Win10 -> Linux Mint, with a short stopover in Ubuntu.
First I ran it dual boot. When I decided to dump Windows completely, I made one big mistake. I didn't understand how Linux designates drives very well, and I ended up formatting one of my drives I didn't mean to.
I don't feel like Mint is lacking, so I haven't bothered checking out other distros. I just wanted something that works, and Mint works fine for me.
The only Windows feature I miss is the big preview in file explorer.
I highly recommend Learn Linux TV on YouTube.