- Spaces!
- Tabs!

Not religious about it, but why the fuck would anyone want to waste time and energy by using multiple keystrokes when one suffices? 🤓

Do what I do, use both

That's all cool and all, but you're forgetting something:
Tabs can be customized how wide they are. Spaces can't.
And I haven't seen any editor that treats space indentation like it would treat tabs. It's always inconsistent. Press tab and you go 4 spaces after, press backspace and it's 1. Annoying stuff like that.

Tabs, because I lose control over how many spaces I use and have to constantly use backspace