#1's.
The Grammy's are kinda pretentious.
The only noms I care about are the ones they don't announce.
Also, down the line people will remember the #1 more likely; saying "Yeah. That song was a hit! It was everywhere", instead of "I think I heard that song before" and needing to google it and finding out it won a Grammy.
I had no idea how to properly phrase that last sentence. Does it make sense?