Sixty, with the caveat of "quality over quantity." Sixty is great is it is a consistent 60. If the frame rate is the occasional 60 that jumps around, I'd rather have a consistent experience at a lower FPS than a herky jerk experience at a higher number.
Speaking of which, not being a techy person, does anyone know why the choices are always 60 OR 30? I get that 60 might be hard to wring out of the hardware on consoles, but why is the jump seemingly then always down to 30? Why not 45 or 50 if they can get it?
In layman's terms, and not to get too technical, it has to do with the refresh rate/frequency of your monitor or TV. This is why the relatively-new G-Sync technology is such a big deal (when compared to V-Sync).