Of course there's a right answer!
Mine! Spaces are the ONLY way to go!
Do you KNOW what happens when you press the TAB key on an IBM 029 card punch? Do You?? DO YOU?????????
NOTHING, if you're good! Card punches don't have TAB keys --- the 029 has an Error Reset key there, like the Good Lord Watson intended! You tryin' to put spaces in your FORTRAN source, you're living in a state of SIN! Repent! Space out!
There's a reason it's called "whitespace", not "whitetab".
Biting the hand that feeds IT
