Whats Better ??? (air ride)

[canadian trucker]

So i have a small problem with my air ride system set-up (whats new) i can't decide between plastic air line or ss hard lines... so which one is better ?? what about moisture build-up in the pipes do to temp change ??

help is greatly apprieciated

Oh and by the way another quick question since we are on air ride
which is a better set-up for the back a triangulated 4 link or a parellel set-up ??

thankx again