If a spinnerbait is all I ever throw, then that's all I'm going to catch my fish on; and of course, one of the bass will be bigger than all others. Keep an open mind.
Read some books, articles, whatever on what really big bass/ trophy fish are caught on. Definition of a trophy varies from region to region, and from reservoir to reservoir.
The right location is THE most important thing, but lure selection and presentation is something to think about too.
EDIT: There are big bass, then there are really big ones, and then there are the trophy bass. Which of these do you want to catch?