If your sole goal is to get more people classified so that they can go shoot state level matches, etc., or to track their progress, the 5x5 is excellent for getting more people through. That was always the biggest obstacle on a club match, because a lot of people want to shoot the classifier but the 90 round course just took a lot of time. Not that the 90 round course was bad, it was excellent for figuring out where you were weak and needed more practice. Heck, if you have the time/space I think you should shoot at least portions of it on occasion just as a metric. But if I want more people and faster results? 5x5 all day long.