I think the less spines the better. You could of course post a picture of a plant with very little spines too. I- It is just a theme for people to think about another section of the cactus and succulent family. And this is a picture contest - so it´s not the best plant which wins but the picture that conveys the theme best.
When thousands of foes unite, for my ruins plot– If only You remain by my side, I then fear not! I live for a hoped union with thee, it is my desired prize– Or all my moments are spent- in the fright of demise! ~Hafez (1325 – 1389): From Ghazal No. 287