It was my wife's idea as we went through the store and saw them selling organic red grapefruit and non-organic red grapefruit.
Here is a few observations that one can take away from this experience. First of all, the organic one was less tart than the other non organic. As you can see, the organic one is all red, which it should be for a red grapefruit. The non-organic one is orange still. This suggests that perhaps the organic one was left out to ripen naturally while the other one could have been gassed to ripen. The organic one was firmer, juicier and sweeter than the other. While there is no evidence to show that organic is better, in this case, it is.