I caught myself badmouthing another agency yesterday when on the phone with a mutual client. It's a lousy practice to maintain, and I shouldn't do it. 

If my work, or my team's work is superior in some way, we should just let it be however good it is. It seems like the appropriate way to win is just to be great, rather than reminding people that you are great *by comparison*.

The greatness I aspire to should be entirely independent of the quality of anybody else's work.