My 10 bore Chambers New England fowling gun is almost in constant use. However, it is a long and somewhat larger firearm...not overly large i.e. excess wood, but the size reflects the bore size. It has taken everything from turkeys, ducks , geese, to deer, and bear. I never was able to connect on partridge with it. The action is too fast and I'm too slow. That is where the 20 bore Officer's Fusil shines. It is up and on target in a heartbeat.
Think about what and how you will use your gun before making a decision. I love my 10, but that fusil is the bees knees on partridge.