Tabs. Spaces are how you end up with one class where one method is 2 space indent and another is 4 and another is 12 because your team all has different prefere

Tabs. Spaces are how you end up with one class where one method is 2 space indent and another is 4 and another is 12 because your team all has different preferences (and two of them are insane.) Tabs means everyone can use whatever preference they want and not be bothered by anyone else's preference.