[Baalz]

Well there are a couple more differences. Revelers cause unrest, which hits that income. Revelers have less hitpoints per unit, along with less defense and protection which means there is more attrition. Revelers not actively fighting can either be stashed in your own territory building up your unrest, or snuck into enemy territory where you hope he doesn't notice and decide you're about to attack him. Revelers do get torn up pretty good by arrows/javelins, which you can mitigate somewhat but still will bite you occasionally. Revelers have a mapmove of 2 and run across the battlefield half as fast. You are right though, that they can certainly deal more aggressive damage and you can do a decent expansion with them, but I'm I don't think you could do anywhere near as economical an initial expansion with them as you could with the brown centaurs, much less the white.