I have both kinds, thicker with the ball on the end and thinner with flower. The thinner ones definitely pucker the fabric way less. However, they do bend much easier and are SO thin, I seem to poke myself with them way more often and it hurts like heck!

The ones with the ball are thicker, pucker the fabric a lot more, but they really haven't gotten bent at all and I've used them for years.

I haven't used pinmoors so I can't say about those, and I don't sew over any pins, ever, even if you are "supposed" to be able to. It's just not worth it to me to chance breaking a pin or needle and having the pieces go flying or get stuck down in my machine.

I hope that helps!
Susan