Considering that the both Hulk and Austin have complained that their finishers contributed heavily to their pain in later life:
Let's say you were a wrestler that wanted a finishing move that was A) Something you could perform on anyone B) Something that you could perform day in and day out with minimal stress and C) Something that actually looked cool.
What are you picking?
Say what you will about Kerry Von Erich, but the Iron Claw and Discus Punch were both pretty great finishers that I think fit both parameters. Or a superkick, but that's a tad overused these days.