Soft luggage ... a big black soft rolling suitcase with a stiff frame for me. Expandable, with a couple of outside pockets. I usually have to carry more than that, so I can stack one more bag on top of that and roll them both.
I lay it down on it's back and open the top and lean the top against a wall, when I'm working and can pretty much see everything. I keep smaller bags inside, so I can take individual things out ... like my set kit, misc. styling tools and supplies, jewelry, scarves, sunglasses ... as needed. And I can remove what I won't be needing very quickly ... to lighten it.
In fact, I have a whole collection of bags, since each job is different. But the basic one is my big black bag. I carry my jewlery (all fake, of course) in a soft carry on bag. And the jewelry itself, is in zip lock bags, grouped by type and color, so I can find things easily. My shoes ... the ones for any particular shoot, go into whatever bag they fit into ... it varies so much. All the smaller bags are framless and soft ... so , if I have room, they fit right into the big one.
The big bag is stiff enough, that I can place it on the bottom of my portable rolling rack, and the smaller bags can hang on the ends, if I'm taking the rack, too. That way I can often take everything, except my steamer, all on the one rack.
I've studied Zuca, because it looks interesting. But I can't see any advantage other that being able to sit on it. A lot of money ... I can get really good suitcases and bags at stores like Ross for a lot less money.
Whatever you do, keep the case as light a possible ... there will be times when you will have to carry it and everything you brought up stairs ... several flights. And unless you have your own assistant, no one will usually offer to help. So .... the lighter the better.