Having played (OK, and lost...) both, I can tell you that as a player, I much preferred the Sale format of beating your opponents to the key word in the question over the Jeopardy format of beating your opponents to the flashing light once you've all had time to process the clue. Sale is more like quiz bowl in that respect. You win by processing the information faster, not simply by hand-eye coordination.
As a viewer, Jeopardy's structure is infinitely better to watch, because everybody at home has time to process the clue.