I was never interested in chronograph watches until recently when I set my eyes on Zenith. I have done a little research and of course Rolex Zenith came up. I am not really interest in answers like "Rolex Dayton" is better or "Zenith El Primero" is better. I am more curious in, what makes a "better" chronograph. Obviously Breitling Navitimer 01 is an in house chronograph, Omega has Mechanical Speedmaster chronograph, Tag Heuer makes chronograph....many other chronograph. What make a chronograph movement better than the other? is it on Accuracy? pieces of jewels? number of gears? smoothness? So far i only know it definitely has to be in-house.