Re: Balanced Action, To Super or Not To Super
The biggest difference is the BA horns have the upper and lower stack toneholes inline - except for perhaps a few BA/SBA transition models. An offset lower stack lends a little better ergonomics.
Like all vintage, there are diamonds and lemons, so you never know until you try a specific horn in most cases whether it's for you or not.
I've been trying to get my hands on a local guy's BA alto with the "boats on the lake" engraving. Perhaps the most beautiful engraving I've ever seen. He's fickle about selling it, though, so it'll probably end up in a family garage sale someday.