Guns should be made/owned/used for purposes; guns are created different handling dynamics, feel, allowable shell power, etc. for by design. More O/U's have been made in configurations suitable for target/duck/high phesant whereas more Brit SXS's were made in "game"/upland configuration. Beyond picking a gun suited to your purpose at hand, the configuration is mostly in your head. However, "in your head" is very important to both shooting well and enjoyment of shooting.