I go with the jr gent for several reasons now. I feel the quality of the components is better, have had problems with the barons fitting loosely during assembly. I prefer the non postable version, which is not an option on the baron, I do prefer the threads to match the plating, instead of being black (except on the 10kgold jr gent, they are black too, but then I don't do gold plate anymore) The cap finial on the gent is larger, and sits into a slight cup on the fitting, so it's easier to replace with a custom one. The centerband is a bit of a PITA to remove, but it's doable. and finally, the fountain pen version is usually less of a markup on the jr gent than on the baron.
Biggest reason is that Mike and Linda are running a group buy right now, and they are 25% off!!!!!
James