There is absolutely no doubt what so ever that you have more control on fixed gear bike. There is more force pushing down on the front end of the bike (try popping a wheelie). That force translates into traction and handling. It's mostly about the fun for me at least. I first rode a track bike in 1987 and always knew that I had to have one, they are special for sure. I agree w/ slvoid too in that I rarely have problems with any of my geared bikes. At least not as horrible as some people claim that geared bikes are so high maintenance. Even my cyclocross bikes that get raced hard every year just need a simple cleaning and oiling up.

If I had to ride a bike all day for work I think I'd prefer the SS. Sometimes you need to take a break. YMMV