Let's turn the controversy up to 11 (not in binary). Feel free to post some more polls in the comments if you want to

What is this data structure called?

Disjoint Set Union

Union-Find

How do you indent?

2 Spaces

4 Spaces

Tabs

No indentation (you need help)

Best language for CP?

C

C++

Python

Java

What type of variable do you prefer?

Local

Global

How do you bfs/dfs?

Deque

Recursion

Some from the comments:

(C/C++ only) How do you I/O?

Cin/cout

Printf/scanf

Custom superfast io

(Inspired by neal.fun)