Hard cases by far! Wish the 12V max came with hard cases! I have a few of those soft bags doing nothing in my garage. I'll go on ebay to find the Dewalt hard cases for the tool. Seems like HD and LOW both seem to be getting more soft cases. But you can still find the case for the matching tool on the 'bay. I love opening up my storage cabinet and looking at about 18 hard cases and just looking at the model number sticking out at me to find the tool I need.
That is one thing I hate. I know some of modelnumbers to keep them apart, but I added stickers on the sides that says which tool is inside. I wish DeWALT did this instead. Or a little sticker with a picture/image of the tool.