That makes for an interesting comparison. What was the year of publication? It would be very helpful if that could be included with PDFs if it is not already on the pages.
I think I could like happily with either of these - and the styling is so neat. If you gave me an X6 I would have to take it out the back and put it out of its misery but the Z8 - yes, it passes muster.
Regards,
Brian