Pooch, You have 4 carbs, right? You want to know which of the two varieties is best. Why not try each carburetor on your motor? You'll soon know which is best and what to sell...Just trying to help you out here, but, really, the best carb is the one that goes best in your application, and there's only one way to find out.....
The 97 was original equipment from 1936 until about the end of 38, after which the 94 became standard fitment, in various guises for the rest of the flathead years. Accordingly, many more 94's are around. Now....all this stuff is getting on in years, we don't know how any particular component has been treated over the years. So, the first thing, after initial visual check of component is to fit it to a known engine and run it. You know your engine...you'll very soon know how each different component runs in relation to what it's just replaced. Irrespective of which carburetor has the most 'value' to the masses, the most valuable carburetor to you is the best performing one. Do not sell your 97's because they command more dollars if your engine runs best with them. You may find you have one excellent running example each of 97 and 94.