I can't speak for the other poster, but in my case gentler learning curve (I've been using vim for about 10 years and I still don't know 10% of what it can do), smooth scrolling, a real GUI (vim's text menus can be pretty confusing at times), and the features vim didn't have at the time like multiple cursors, command palette and go to anything.

Why do I keep using it? Because generally new functionality requires about 2 minutes of readme.md and then it is working, rather than half an hour of hacking with vim config files.