I'd say it depends on your needs and hard or soft shell is incidental to availability of what fits your needs.
I wanted to carry my mavic in the topcase of my motorcycle and have it easy to pop out. I also wanted the ability to carry a iPad mini relatively protected plus my Sony mirrorless digital camera. That pretty much dictated a small photo backpack, Amazon has a cheapo for around $25 that is just about perfect for my needs as it carries everything I mentioned and a skosh extra for the charger when I'm on the road.
Anyway - point being it seems like all the hardshell cases are pretty much dedicated to only a MP, 3 batteries, remote and maybe room for a charger. Those hardshells are also a tad over built IMHO adding weight and volume to what was supposed to be a svelte small package - otherwise get a Phantom.
Then there are molded shell packs that are like backpacks but have a quasi rigid molded shell. I would have loved one of these but none had any extra space - just the standard Mavic list I detailed before.
It seems to me that with equipment there are two endpoint types with folks falling somewhere between the two:
Backpackers - they travel light and with a minimal of equipment. Hop on a bike, ride to location, schlep to the top of a ridge, pop the top of your pack in a clearing and turn her loose.
Kitchen sinkers: They love to have all the accouterments; vest, pylons, landing pad, Mavic, ground control case, tripod - they need a pickup truck to schlep their stuff to a site to fly. Pretty much they fly where they park unless they remembered to bring the pack horses and Sherpa guides.
So which type you lean towards will pretty much factor into the discussion at hand of case type.