My preference would also be the K-Line version, mostly because the tender has more detail (water tank hatch, rivets, back-up light to name a few), but also because of the TMCC. I concur that the ladders are over-sized compared to the Williams, but a good modeler could remedy that, if desired. Oh, and the difference between "cow-catcher" and "foot boards" could simply be the time period modeled by the builder.
Chuck
