I like 2 spaces, because I dislike wrapped lines and I hate horizontal scrolling, and a 2-space indent (even a few levels deep) leaves more room for a reasonably-long line, while still being visually distinctive enough to make the indentation useful.
But this is, like, literally the least important thing I can think of. I will do 6 spaces if that's the code style of the project I'm working on. Consistency is more important to me than personal druthers.
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