What an entertaining thread! For sound, unbiased advice, you need go no further than Mellow's response back on page 1.
Like others, I also own both. However, I think we need to qualify which incarnation of the ST and the 'Wing we are talking about when comparing the two bikes. I've owned a lot of bikes during the last 25 years. I've had 2 Venture Royales, 2 Wings, 2 ST's, 2 Connies, 2 FJ1200's, several Harleys and a bunch of metric cruisers to boot. Touring and sport touring have always been my favorite type of riding. The point of my mentioning my bikes is not too gloat, but rather to illustrate that I've found that even the same model of bike will vary greatly from model year to model year.
Case in point. I bought a 1984 GL1200 new, and sold it just 5 months later. It was boring, boring, boring... I hated that bike. It had mediocre power, so-so handling, and no personality whatsoever. That experience moved me squarely into the Yamaha camp, and I ended up owning 2 Ventures. The Ventures were great bikes - everything the GL1200 wasn't. They had much more power, handled better, and a wonderful sound eminated from that V4 engine (essentially a detuned V-Max mill).
Fast forward 20 years. I bought a 2005 GL1800 and couldn't be happier. The power compared to my old '84 GL1200 is off of the charts. Same for the handling. Styling on the GL1800 is gorgeous. Honda absolutely hit a home run with this bike. I've also ridden the GL1500, and while refined, it was much closer to my GL1200 than my GL1800. The difference in power and handling between the 1500 and 1800 is night and day, with the 1800 coming out on top in both categories in a big way. I also never cared for the styling of the 1500, but obviously this just comes down to personal preference.
As for ST's, I've had both the 1100 and 1300. The 1100 was a wonderful bike, but not terribly exciting. It was supremely comfortable, had very long legs, and had decent, although uninspiring power. It had a power curve that was as flat as Nebraska. Honda got this bike correct right out of the box. If only it had another 20 horsepower and some updated styling. Then along comes 2003, and Honda does it again. The 1300 version of the ST has stunning styling, but the real fun lies in the updated engine. While the 1100 had ok power, the 1300 will get you up to go-to-jail speeds
real fast. There is no comparison between the 2 engines. I liked my ST1100 , but I
love my 1300. Again, kudos to the folks at Honda R&D.
The whole point that I'm trying to make with this post is that when the original poster was asking for a comparison between the ST and the Wing, I felt it was important to realize that the new Wing is nothing like it's predecessor, and the new ST is much improved over the 1100 as well. I still have my Wing (an '05) and I don't ever plan on selling it. It does everything amazingly well for an 800lb bike. I also have an '05 ST, and I don't ever plan on selling it either. It's sufficiently different from my Wing to warrant keeping both.
For 2-up riding, the Wing gets the nod every time. For solo flying, I'll take the ST 90% of the time. If I could only own one bike, it would be the ST if I was single and the Wing if I was married (assuming my wife likes to ride, which she does). Many posters here have said that they find the Wing to be more comfortable than the ST. In stock configuration I find this to be true, although the Wing seat for the driver is not as comfortable as you might think. With the proper modifications (risers, Sargent, MCL peg lowerers) I find that my ST is now the most comfortable bike I've ever owned. My ST1100 (1991) was equally comfortable, but again, with several mods for the ergos.
Sorry to be so long-winded, but it seems to be a fault of mine. Once I get started talking about bikes it seems like I just can't shut up.
Doug
My present bikes ('05 Wing, '05 ST1300, '06 Street Glide)
2005 ST1300 (metallic red)
2005 GL1800 (metallic blue)
2006 Street Glide (pearl black)
www.dougmeek.com