[Confusion]

By popular vote: spaces. See https://medium.com/@hoffa/400-000-github-repositories-1-bill.... Previous discussion: https://news.ycombinator.com/item?id=12397246

[bialpio]

I love how the author first scopes down the discussion to rule out the alignment case and then "proves" tabs > spaces.

[splodge]

Paste a tab-indented SQL statement into the MySQL client, and experience real joy

[mrvivaldi]

Spaces all the way. Tabs go wrong between different operating systems.