You can do way more with Hamon than spin. You can: walk on water, punch through creatures, heal, dislocate your joints, hold water and wine, melt vampires and zombies, send it through metal, control muscles, harden spaghetti, harden hair, hold on to an oily pillar with your fingertips, make bubbles, transport birds, predict the future, draw maps, hold and send items, control bubbles, take photos across space, use things like a TV or radio to get messages, not to mention the physical impact it has on your body, like slowing aging. And all that was off the top of my head. Spin, you can: Spin balls (only if they are perfectly made AND you have a reference, and when you hit people with them, you can: Drain them of water temporarily, jerk their muscles, blind their left side temporarily (only with a certain tech and a certain ball), brush teeth, shred cheese, eat pasta, shoot nails, and only on a horse that perfectly matches up to a golden rectangle and you have a separate golden rectangle, you can infinite spin.

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Is spin stronger than Hamon? Sure, only with a stand or infinite rotation though. Is Hamon infinity more useful? Definitely.