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Why is this? Are the bigger ones better? Does it hurt to put in?
The four you've chosen vary in size quite a bit-from less than an inch in diameter to 1.5 inches. So, size preference will depend on what size you prefer in other insertables, dildos, ect.
But also pay attention to texture. I've tried two different brands - LELO Luna Beads and Fun Factory Smart Balls. They were the same size, but the Luna Beads had a smooth surface that made insertion easier and made them feel smaller. The Smart Balls did feel uncomfortably to me, even at a size I'd normally be comfortable with.
They should not
hurt when inserted. If you end up with a set that isn't "slippery" and feels uncomfortably large, try using lube—that should help with insertion and comfort level.