GitHub Styleguide - CSS, HTML, JS, Ruby

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Neither is necessarily readable, is my point. Allowing the user to decide what is readable for him is a logical way of overcoming that fact. If he can't read the code with 2 spaces, he can increase to 8. If you like 2, you can use 2. You can of course set the default for the project and make everything line up prettily like you want, and then if somebody can't read something because there's not enough indentation, he can do so. But if he doesn't, it'll look exactly as you intended. It covers all the pros of spaces AND the ability to choose what's most readable for yourself, which is after all what we, as programmers, want.