Me personally, I'd choose The Ripple/Hamon. Sure, the Spin is also pretty awesome, but I honestly don't know much about it since I haven't read Steel Ball Run. That, and The Ripple/Hamon seems to have a lot more use outside of combat as well.

Likewise. Hamon can extend your life to nearly 200 years and retain good health outside of injuries so it seems like a good choice to me.

7255804
I know this is two years old but i'd go with spin. being able to break through dimensional barriers or screw over an opponents through rotational power sounds awesome. Also helps with accuracy and range apparently. Also, muscle manipulation.

I wouldn’t really choose

I’d try to learn them bith and see if there was a way I could use them both simultaneously, like empowering a steel ball with a surge of hamon while using the spin