I have a JD and my parents have Who Dunnit as their only game. JD is the far better player and has better/deeper software. Who Dunnit has unbalanced scoring and lacks a wizard mode. Who Dunnit is far better for newcomers though, and even has a novice mode (timed play) built in. JD is not very newbie friendly and has short ball times. I think your answer comes down to the type of player that will primarily be playing the game.