Me personally, I hate the single case displays. I don't want my collection looking like a museum.
Unfortunately I have a bunch of them because of my MR items. I feel compelled to use them because, I know that probably $100 of the MSRP of the item was due to the display case. However, I do not display my other fan made lightsaber hilts in such a way. If I had my way, my collection would be displayed like the walls of Dok-Ondar's Den of Antiquities at Galaxy's Edge but that sort of thing is not realistic for a growing and changing collection and other issues as well.
I think individual cases are okay if you intend to have one or two hilts. But if you intend to have a large collection or change out your collection, you should have a method that allows you to add and subtract without much issue or expense. Cases can get pricey. For each hilt you get, a case or separate stand can add up and I would rather use that money toward other prop replicas.
If you are looking to protect the hilts from dust, I think it is more cost efficient to buying a Ikea cabinet and putting in the lower cost high tiered acrylic stands or what I do, interesting looking wine racks. With the the right rack, you could display 32 hilts in the cabinet (2x racks per shelves holding 4 each. And if you do not have 32 hilts to display, you can just put other SW items or props among the display. But at least it is easy to add to change your collection without continuing to invest in cases.