it appears more in line with the pocket watch movements by A.L.Breguet in my opinion. To me the Tradition is about bringing back the appearence and design of the Breguet pocketwatches and for this reason YG is the ideale metal to do so. The WG version has a more "contemporary" feel to me and personally I would be tempted if the wheels are rhodium plated as well.
Cheers,
Roger