Now here's the thing, I'd choose the (and lord I added an "a" to Mori) Mori Mori no Mi if I can create edible crops such as tomatoes, corn, squash, etc etc. So far we haven't seen this Devil Fruit create plant life such as different varieties of fruits and vegetables, but its highly possible it does have that ability. If so, anybody with this fruit could be a step closer (or even be there) to solving world hunger. Solving world hunger is debatably the one issue that would give you the most fame in real life since you'd solve a big issue in the world lots of people (and even animals) go through in life each day.
But if I can't create other plant life (again, mainly edible fruits and vegetables), then I'd likely go with the Goro Goro no Mi since I'm an infinite supply of energy. So is light, but we got light everywhere in the world I lean towards being able to produce infinite amounts of electricity would be more beneficial even though being an infinite source of light would also be close to being just as beneficial. Either way, all four Devil Fruits would be extremely beneficial in every day life in one way or another, so there is no wrong answer.
Moria Mori no Mi
Goro Goro no Mi
Mera Mera no Mi
Pika Pika no Mi
