I have whichever one doesn't have the potted modules. At one point I started modding it, swapping ic's, recapping, etc. I started comparing side by side with a gml 8200. No mods will improve the orban enough to make it worth while. It will always have a single sided pcb with long snakey traces and crappy pots. Maybe if you don't have a superior eq like the gml, then the modest improvements of modding will be worthwhile?