I'd rate neoprene & Ensolite a bit firmer than true casino surface, but not by a lot. Casino's may be an open-cell type.
Going thicker with Volara isn't going to do much, it'll still going to be harder than neoprene.
The premium neoprene at FoamByMail is a tick softer than Ensolite(Gym Rubber), but costs more & can be had in 3/8" thickness if you like.
Since I have a build coming up I found an
eBay seller listing 3/16" neoprene sheet. I ordered a foot of it as a sample to get a feel for the density vs FoamByMail's.
I can let you know what I find out when I get it in if you want.