I feel especially bad for the VW mechanics. I hope they get good disability insurance.
Pros and cons of the joints-------------------------------ball and socket joint:+ can absorb torsional vibrations- cannot absorb changes in length+ allows a large range of motion from a compact overall length- joint is wider and the springs stick out to the sides+ highly durable. Over-flexing usually does not result in damage to the joint.- replaceable gasket in the high quality OEM joint+ can be easily separated for easy servincing
convoluted tubing flex joint:+ can conform to changes in length- cannot absorb torsional vibrations- relatively fragile. Without stainless braiding, overflex can damage the joint.- Difficult/expensive to replace if damaged (welded in)- needs a relatively long length of tubing to get a large range of motion+ sleek and narrow - does not have springs sticking out the sides- cannot be separated for servicing - slip joint is required.