The first 2/3 of Langley is easier, the last 1/3 well it sucks... As others have mentioned the round trip mileage is more or less the same (give or take a mile) and the gain is ~1500-2000 less than the Whitney main trail. On paper, it's easier, but the slog up the last 2k' of Langley is scree and/or rock and boulder scrambling. The scree is the worst and the longest of it.
Old Army pass is currently clear the whole way up. The tiny patch of snow left isn't on the trail.
