Ehhhh, both suck. I HATED DMR battles in Reach on big maps because it was just both of you alternating taking a shot and descoping the enemy, then him/her taking a shot and descoping you until someone died. My reticle is on my damn helmet visor, why is it zooming out when hit?
Those battles would be much more interesting if only the game had so much less aim assist. Putting the blame on the descoping mechanic is pretty dumb if you ask me.