The debate of aura vs. aria really comes down to how you play the game (group/raid, melee/casters, etc). I use aura (and the songs i listed earlier) for my group of Warrior, Ranger, Monk, Bard, Shaman, Cleric.
I do it this way for two reasons. First, on avg, mobs die in approximately 25 seconds (HoT T4) and I don't think the extra triple attack/flurry boost from aria vs dot/resist debuff song is gonna make them die much faster.
Second, I've found its more efficient for me to pull 2-4 mobs at a time and use the bard for CC, twisting in what songs he can between mezzes. I spend more time killing and less time pulling.