Imo rd is the best mode for a serious non-cw dota-match with experienced players because its much harder to get hero-pick-wins with rd then it is with sd. As we are playing in .xp players should be able to pick heroes to counter the enemy one's what makes the game much more even resulting in more fun for both(!) sides.
playing the same heroes over and over and over and.... is not fun. rd is like "dota basic". ur team has 15 heroes to choose from in sd. that should be enough.