Yeah Linus uses Fedora because:
- Stable release schedule - he knows when he'll have to do major upgrades
- Stable software - he knows stuff he isn't messing with just works
- Don't modify their kernel much - this rules out Ubuntu which is the Debian based distro with a stable release schedule
I know KDE devs rate opensuse highly for similar reasons, if you primarily develop 1 app/framework/kernel you don't want the fun of irregular updates that haven't been properly tested (or have been tested and need manual intervention anyway) especially if those updates could potentially break your thing.