Lower price. Longer service life. In all cases at 50% or less money than Yanmar. - even if service life was the same a much better deal. Moreover, the coupler (that broke when you took yours apart) is far more robust and HDI has taller ones so you can take all advantage of mixing elbow height.
Have installed several and no more Yanmar elbows for me and mine- unless someone can tell me why not
Charles