Need help choosing between 2 tenga spinners

I’m trying to pick one up and am currently deciding between the bead or the shell. The bead is less hard and more stimulating, which I like, but it has a larger diameter (4) than the shell (3), which I guess means it’s looser. I like toys that are a bit tight, and the shell provides that feeling, but it’s harder (2 more than the bead) and a bit less stimulating. Any advice? If the tightness doesn’t change much, I’d go with the bead

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