I think that was discussed on the other site recently. One advantage to some is the turning radius with the ISS is shorter. I have to agree about the ride although my recent experience with an ISS coach was on good roads. It might make a difference on certain types of roads.

What I have not seen mentioned or discussed is the service requirements or durability of the ISS. I don't doubt that it has a long life, but with a larger number of parts moving in multiple directions I would suspect the lubrication is more involved and I also question how big an issue alignments are.

It is a moot point however because after a certain serial number you will be getting the ISS anyway.