I would not use mircospikes going over Army Pass, they do not offer enough bite...and I do own and use them for trail walking.
Cottonwood Pass is the safest route when snow is clogging the other passes. Going over Cottonwood will allow you to summit Cirque Peak before doing Langley. Just exit the PCT when you see Cirque and head straight for it. When you leave Cirque stay as close to the edge as you feel safe till your reach the New Army Pass area then head for Langley.
