I ride single speed. Why? It makes for a simple bike and however hard I pedal translates pretty well to the wheels. The downside is climbing hills, but w/e. Yeah, it makes maintaining a bike really easy and overall just really simple.

Fixed gear, I'm not a fan of. I like coasting, so that pretty much rules it out.

Would I like a nice road bike with different gears? Hell yeah. But money is tight and I'm happy with a single speed