I have the AG400...I'd take the 380 unless you need the extra rating. There seems to be an engineering flaw related to the harmonics that causes brake component failures; specifically brake chambers and s-cam brackets. They came up with a mickey mouse mod that comes on all new trucks or can be installed on older ones. It has reduced the frequency but not eliminated it. At least in our case. I don't know about the ride comparison, as I've never driven a 380, but from what I hear, it's pretty much bulletproof.
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