I got free samples of all the fabrics. They took a long time getting here, but that is to be expected with international shipping. They all feel good to me, which is surprising because I'm autistic and find some fabrics horrible that other people like. Here's what I think of each fabric:
Peach skin: very smooth in a way, almost rubbery. Too thick and inflexible for extended use, but if you buy a lot of these then the price difference might well compensate for the lower quality.
Japanese textile: This is almost the opposite of the peach skin. Instead of being smooth it is silky and instead of being thick and inflexible it is thin and stretchy. I'd kind of be afraid of it tearing though. Seems too delicate, but maybe I'm being paranoid.
Natural velvet: I am extremely surprised that I like this one. Velvet is usually something I can't stand. It is still too fluffy for my liking and as I understand it this has the lowest printing quality but it is so, so soft! Weirdly I think this is the one that feels most like flesh, or rather least unlike it. Doesn't have much stretch but I don't see you needing to push or pull it much for tactical stimulation, just brushing it against you is nice. I can definitely see someone of different sensibilities deciding this one is best. If image clarity isn't a major concern or if softness is very important to you than this is what you'll want.
2 way tricot: Like a softer, more durable, and even stretchier version of Japanese textile honestly. It doesn't have the "warm" quality of the velvet, but it would have a clearer picture, would in my opinion be better for rougher usage, and is probably a lot easier to clean. Then again it can't give the same fuzzy feelings as the velvet, so it's not the best for everyone.
So I guess my advice is to go for the 2 way tricot if you can afford it, because it already has anything peach skin or Japanese textile can offer other than a slight rubberiness or possibility of tearing.