yea i prefer VoW, EoA, or Arcway at higher levels.
CoS scales really rough though on weeks with Tyrannical the last boss will destroy folks on anything higher than a 14 unless you've got a stacked group. not to mention him being nearly impossible on weeks with tyrannical/volcanic (his shadow adds also spawn volcanic puddles).
the swiftblades/soulkeepers in MoS are some of the hardest hitting non-boss mobs in the game and all the pulls inside the boat leave very little room to maneuver. the mini-boss Skadi on the boat is also boosted with fortified and the adds spread necrotic so unless you clear a fairly large area or have battle rez's he's really hard to get down.