Originally Posted by
Qualia
On the other hand, stacking means everyone will have to move frequently to dodge each time Trample or Fire debuff goes out then stack back up, which lead to less damage / healing = longer shield phase / longer shadow / fire debuff staying up. The only real benefit of stacking is to clear shadow debuff faster, as even with the raid spread out nicely, frozen orb slow is easily cleared with Stampeding Roar / WW totem and you only need one Suppression Field at a good place.
So in the end, it come down to which is more annoying to you, and I'd say that at least to me, having to move at least once every 15s is way worse than letting the Shadow debuff be up for a few more seconds (which may not even be the case if you assign throughput CDs to get rid of it).