jagermeister- They obviously look different, with the Douglass being more English in styling, but I'd say the Heym and Wm. Douglass are physically comparable and that their handling characteristics are comparable as well.

For the price, you’re getting a lot of quality in both guns and wouldn't be disappointed in either one.

Sidelock vs. boxlock? Well, that's a question as old as the two designs. Fortunately - or I guess unfortunately - the cost of the two is usually the deciding factor for me!