ST, hands down. Rides nicely, allows you to adjust ride height. Good quality. I've even had fairly good luck running it on the track in advanced run groups, and its my daily driver. I personally think that 18" wheels are insane for a true DD BTW, but that's a trade off we all make. ( I run 16 x 8 x 35mm w 245/50-16 summer)
I guess you are either new or dont follow. I have posted extensive reviews (search), and there has been much discussion. Pretty much everyone likes the STs, although one or two have noted that they have a difficult warranty policy. That said, i dont know of any proven failures - only one claim that was never substantiated.