Some questions/advice:
If you are traveling by air or some other complex transportation in which the case and it's contents are out of your hands then you should be using a hard case such as those made by Pelican.
But if you don't have the needs as outlined above, I would avoid going with a hard case and instead consider two soft cases for your firearms. Hard cases are just huge and unwieldy. They take up a lot of space when not in use, and are heavy and hard to maneuver when in use.
But double soft cases are also pretty difficult to maneuver. With their heavy contents, flexibility and no wheels, you are stuck carrying, dragging or a bit of both.
Two soft cases can each be optimized for their contents and though it's twice as many bags to carry, each one is pretty easy to maneuver.
B