C macro/#define indentation? -

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I'm curious why I format almost all macros in such a way: 

  #ifndef FOO # Define FOO #endif

Or this: 

  #ifndef FOO #define FOO #endif

But never: 

  #ifndef FOO #define FOO #endif

(Also, vim's = The operator only feels that the first two are counted as correct.)

Is it between the compilers due to portability, or is it just a standard practice?

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