Don't let the hood scoop fool you, I drive a TS
The major difference between the TS and OBS would be a slightly lifted suspension on the OBS, and a little softer sprung. So it's handles a little worse, but a little more off road capable. It's 2 tone paint. I think the OBS comes with rear disc brakes, while the TS has rear drums. I'm not sure but I think the OBS also comes with a rear viscous limited slip, while the TS's rear differential is open.
If being off road or ice road cabable is more important to you, the OBS is probably a good bet. If it's more of a road car the TS could be what you need. Don't take me wrong, the TS will handle mud, rain and ice just fine too. I went out last time the roads were iced over and didn't see any other cars for the 2 hours I was playing around, on the main highways, but I was getting around no problem. I even slid off in a wet icy ditch while I was playing and pulled back out on the 1st try with no effort.
I pay about $170 a month for a 20 year old with full coverage.