I believe the question can't be answered for these reasons:

1. We don't know what steel either of these are made from.

2. We don't know the manufacturing process. Example: is it cold forged, machined, welded on, pinned, etc.

3. We don't know the temper and the method of temper.

4. The Purdey has the advantage of more leverage keeping it closed, but it also appears that the hinge pin is the smaller than the Jones. The hinge pin is the weakest link in a double.

5. Neither of these have an upper cross bolt, which I personally prefer to see.

RobertD