Which had the greatest hand velocity among these four?

Calzaghe was the master at slapping. He says it's was because as his career progressed, his hands became too fragile.

 

Why does it say velocity in the thread title?

 

There a technical difference between the twain but I assumed that readers would understand them as equivalent in the context of a boxing subject. Another reason I used a different word is because as a writer I am in the habit of varying word usage in order to avoid monotony.

http://www.differencebetween.com/difference-between-speed-and-vs-velocity/

 

I know the difference already. That's why I asked why you are using speed and velocity interchangeably when the two words are not interchangeable.