Just my opinion but running catch dogs do not catch as hard as a straight up catch dog.....Now there are exceptions but not the norm..The reason i say this is cause running catch dogs are usually crossed with a cur of some sort to give them the endurance that a bulldog does not have. Now with all that said one of the best catch dogs i know is a catbulldog. So like everyone has told me it really dosnt matter as long as they get the job done the way you want it done. Im trying to stay away from crosses because of the bad experinces ive personally had. does not make them bad just my own preferences. I know guys who only use pit/ cur dogs for catch. Just not my style. its kinda like clothes there are all different styles but serve the same purpose cover our rear....