AO3 etiquette question

Not that I'm expecting that this is exactly standardized, but suppose you like a fic enough to leave a comment saying so.  Is leaving kudos as well simply standard operating procedure, or does it indicate an even greater level of enthusiasm than would be communicated by either kudos or comment alone?

I guess I could try to answer my own question by cross-referencing comment authors and kudos-givers, but I figured I'd do the lazy thing first.