I've always written the whole note rest on the 4th line of the staff and the half note rest on the 3rd. I always see it that way and never thought much about it until recently a musician with a lot more experience than me wrote them on different lines and when I pointed it out that person said that it didn't matter and they could just be written on any line.
I was left wondering if this was true or not. Personally I see no reason to write them anywhere else, since I think it would be pointless and maybe confusing. I'm asking about the correct notation. Do these rests belong on specific lines or not?