An Uggie for half the money is half the gun. That's why it's half the money.
Markets don't lie.
Actually markets do lie when it comes to the question of quality. Quality has to do with how well something was made, not the price it commands or the speed with which it will be sold on the used market. Those issues are more greatly affected by brand name value and/or collectibility in our little corner of the world.
For real world examples we just have to look at the long term realized auction price valuation tables created by Rocketman here to help with assessing the likely value (selling price) of English and Continental guns. The biggest component of current value is Brand Name. For double guns Branding includes both the actual maker as well as his location (London, Birmingham, Liege, St. Etienne etc)
I quite agree that markets do not always determine what is best, but balance value against demand. There are many guns without a great name that cost much less than the same quality of design and build with a name.
You can get a better belgian gun or french gun for the same money on a well made brit gun. While the french and belgian guns are in less demand and you would not have as easy a time selling it, I would look there if performance is your real bottomline.
I also believe the Spanish guns to be a value too. And to answer your original question lay the two guns next to each other try each mounting them and swinging, and pick the one that feels best. If you can't do that then roll a die as if the examples are equal builds its luck. In the same class and price it often comes down to feel and taste.
