You may not enter a flamewar if you haven't tested the options for at least a year.

Emacs vs vim? Not reeeeally used both? You're out.
Allman vs 1TBS? Same.
Which OS?...

I swore by Allman. Tested 1TBS to understand why they'd possibly want to do that. And I liked it. Now even GNU style makes sense to me.

Had to tested Mac OS and see this "it just works" for myself. I hated it. Now I can bash it in an informed way >:)

1. Emacs (but vim on headless servers) - albeit I prefer other editors.

2. 1TBS (used Allman during my Pascal/Delphi days and still using Allman for SQL).

3. Linux (but I'm OS agnostic, so Windows is acceptable if must be used - never used Apple products)

4. Tabs or spaces? ;)

@firusvg Why use emacs if you prefer other?
Tabs... I have only used spaces only, but I'd like to try "tabs to indent, spaces to align". The only thing that could break is the column limit.

@firusvg Linux is not an OS, it's a kernel >:P

@Gauthier Emacs only if I must choose between Emacs and vim. ;)

@Gauthier B) I believe you perfectly understood what I meant.