I'd say put down all the fruits used...with the understanding that, as some have already said, some judges will be critical because they fail to "taste or smell" so and so fruit...but some judges will give you useful feedback.
I enjoy competitions, both as a judge and entrant. They can be a lot of fun if you actually attend the event. But I know not to expect perfect judging skills...as you often have judges who are still learning the skill, just as you have homebrewers entering who are working on their skills. But judges have no chance to improve unless there are beers entered to judge...and those beers have factual information about their ingredients or processes (only where required, of course).
If you manage a ribbon, that's nice, it doesn't hurt anything....as said already, with time it may fade in importance. But if you do get a scoresheet from a truly qualified judge, then you may find you're getting some very useful feedback. But there are no guaranties.
And +1,000,000 to what punatic and Mikey said: seeing someone really and truly enjoy YOUR homebrew is a huge reward. I value that more than ribbons...but that is a personal choice, just as anyone else can choose to persue ribbons for the fun of it.