According to the IAP catalog, there are Chromadoras with both 30 and 23 mm offsets. The 23's would give a slightly wider track which is better for handling. The Panasports, again in the IAP catalog, are 22 mm offset which is ever so slightly better again. Panasport may make other offsets but you can only go so far before you encounter fender clearance issues. How far you can go depends on the tires you plan to use.
As for weight, I have an old bent 15x6 Panasport which weighs in at 14 lb. A 13x6 should be slightly less.
My guess is that there isn't much preformance difference between the lower offset Chromadora and the Panasport. Which do you think looks of better?