Buy them with either a aluminium hard case for transporting the models you need out of the house, or use the multicase wrappings - I have the 2x cardbox holder multicase and its fantastic, light and durable and when I buy more card inserts for my other units I can swap them arround.
Comparing the larger GW case to the aluminium equivilent from KR i would go with the KR one very time - I have seen far too many large GW cases with the clips and hinges breaking or becoming far too loose - that said they won't dent and are hard as hell, really its preference and whether you want the option of swapping stuff in and out quickly.