It depends upon the man.
For instance, if you have a hunk, you want a dude with nice rough large hands, something that shows he works. Something that shows that he creates of does other manly constructive things. Almost like an extension of their muscles.
If you have say a thinner person, say they are an artist or a musician, you want to have their hands thin and long, perhaps softer than the hard working mans hands. More an extension of the mind rather than of the body.
Considering what can be done with hands, hands are an extension of the person. And also, we all can understand what happens with hands and privates so I'm not elaborating on that.
I like hands too, but that might because I had a period of time in High School where my hands were so covered in severe eczema that it looked like V's hands. I just wanted to hold someone hands.