New Army Pass is about the same distance -- the difference is negligible. "Old" Army Pass tops out about 300' lower elevation, so that is the main advantage.
Since it looks like you're planning a Langley trip, let me encourage you to take the no-longer-maintained South Fork trail. I think it saves a little distance compared to the CW Lakes trail. I took it 2 years ago, and missed the junction, and got off-route only one other place (approx
here).
The junction off the main trail
is here, 50 yards after it crosses the creek. It is little used but easy to follow. Here's
where it re-joins the maintained trail by the South Fork Lakes.
If you would like more gps markers, let me know. ...You could make a loop hike -- south fork trail and New Army on the way in, old Army and the main trail on the way out.
