Sean-I didn't clean the 740 this week, I detailed his wife's Navigator (the one on the first page) and she was driving the BMW. I like the look of SG on the silver Z4, but I think since UPP looks a bit wetter, I like it more on dark colors.
Both SG and UPP are pretty slick but UPP has the advantage there. SG is easier to use if you employ the Bill North method of wipe on, wipe off. UPP needs to sit (according to what I read on premuim auto care) for 45-60 minutes to properly crosslink. To me, that is an ease of use issue, especially since it is so windy here. Last thing I want to be doing is wiping dusty UPP off a black car. If you have a garage to work in though, it really isn't an issue, other than waiting.
On the Pathfinder, my preference is VM....once I started using it, I sent the remainder of the S100 SEC to Pats300zx. Not that it isn't a good product, I really liked it a lot, but I like VM even more.