I have to agree. It is personal preference but I prefer the two piece pipe. It is easier to tune the pipe to suit the engine and so far I have experienced the opposite.
I have never had a pipe come of the manifold. It all depends on how you secure it and what tricks you learn along the way
. Using GS couplers also really helps. As far as durability goes, I have noticed that in-line pipes are more prone to total destruction when hit correctly as they simply crumple at the joint instead of the rubber joiner popping off. But a two piece pipe can be crumpled also but they take more abuse in my opinion.