LISTEN to both before deciding which one sounds better for you. PLIIz is very subtle, so you may need to go into the speaker set-up menu and raise the volume level of the heights in order to really hear the effect.I would like to use a mode which won't disturb/alter the sound going to the 5.1 speakers much, at the same time send special effects (rain, helicopter etc) to the heights. After reading your post I think IIz will be better for me.