I think I like SS a bit better than fixed. Perhaps it's just that my SS bike(coaster brake, actually) is a bit more comfortable overall. But riding fixed, to me, is kinda like driving a nice old sports car with a finicky transmission. You have to keep on your toes all the time to avoid grinding, etc.

One of the things I really dislike about gears is purely psychological. I'm a person who, if I have levers and buttons, must fiddle with them. Turns out to be quite a distraction and drain on my mental energy. I find that without them, they aren't missed. Of course, it helps that most of my riding is over relatively flat land.