What do you prefer while programming, Tabs or Spaces when indenting code?

I wanted to see what everyone here used. I heard in languages like Haskell, spaces are a must. In Makefiles, TABS are a must.

But let's talk about our personal preference! Mine personally is 2 spaces. I feel like the code is easier to read. However, in my IDE, I press the Tab button to create the 2 space indentation.

So what do you prefer?