I like vim because I can use it in a terminal, over ssh, etc. The actual text editing capabilities, the quick access to search and replace, and the ability to work without taking my hands off the keyboard to use a mouse are all big wins for me. It's just one editor, and a lot of people like Emacs (I have nothing against them, it's just not really my thing) or some other editor.

Frankly, the biggest thing is to pick one editor and stick with it. As far as IDEs go, I've used PyCharm for debugging before. I think it fits a lot of use cases but like most IDEs it's slow, so I don't use it for writing and editing