I purchased the touring screen for my ride to the forum rally this year and felt it did a better job deflecting air flow higher, but both screens create more noise in my helmet that I expected. Nothing some good earplugs couldn't solve!
Another issue I had with both screens, but even more so with the touring screen, is the wind flow over the top of the screen causing movement of the fairing enough to change the turbulence around my helmet at higher (70-80mph) speeds. When I got home from the rally, I researched a fix and came up with some brackets to secure the top of the fairing. Now I find the touring fairing works much better and doesn't move at any speed. I keep the touring fairing on full time now that works like expected. By the way, I am 5'10" tall.
Here is a link to my post on the fairing braces I added:
http://cb1100forum.com/forum/showthread....ht=fairing
Good luck with your research!