Unarguably VS Code. One of the very few Microsoft products that are actually worth using. It has been made using the same Atom technology ( Electron framework to be precise ) but the kind of optimisation they have done makes it work like magic. It's lightning fast, to be honest, unbelievably fast. It looks and feels great to use. Supports tons of plugins, useful ones.
All in all, it is good at what it's supposed to be good at. Fast text editing.