How many answers can I give for this? Can I make it a top ten? Twenty?

In all seriousness, for me it is about the progression, not a single type of pain all on its own. I have grown very fond of the crop for example, but wouldn't care for it in the least if Master were to just walk up to me and start whacking away. The sweetest pain is a little light spanking first, the application of nipple clamps, some pinching and teasing then on to the crop! Hell, bring on the cane at that point my body is so blurred as to what is pain and what is pleasure that it's all sublime by then!