For boss in any tier, there's really no reason not to do SV+Troub+Night 3x brd rotation. It takes like 1 min tops to do and 6 songs + cor rolls is just silly good for a zerging.
For normal mobs, it's hit or miss based on your people really. I personally feel that 2x brd rotation is better than 3x, since double mads and double minuets is pretty overkill, but we also run a cor in each melee party. 2x march+mad+min+drk roll+sam roll is plenty of power and ensures the songs will stay up full time. With meat and dia, that should get attack very close to cap, acc capped, and still double march+sam roll for sick kill speed. If you get, say, chigoes, you could switch to drk+rng rolls and cover your acc needs fine.
With 3x rotation, I found songs were dropping before going back up, and losing marches part of the time for the sake of an extra mad+extra min that probably weren't adding anything to our kill speed felt like a waste. We probably could've gotten it down faster if we kept at it, but as one of the party leaders myself, I hated 3x rotation vs. 2x rotation for normal mobs. Just seems like a lot of extra work to overcap my acc and attack.
XI Wiki



