My experience follows along the lines of what others have said. Crossdraw is better for carry while driving, but is does not conceal as well as the various strong side types. It is my preferred method of carry when I am not concerned about the gun being concealed. It is a comfortable was to carry a large handgun.
If I have a rifle, I don't need a handgun, so I do not have any problems with strong side carry interfering with a slung rifle.
If I have a rifle, I don't need a handgun, so I do not have any problems with strong side carry interfering with a slung rifle.