Here are my findings for both, which are interesting, if you're counting calories and on a diet:
Cooking for consistency, initial consistency of rice cooked in Instant Pot is better, but yields much less rice, Rice Cooker yields almost 25% more rice per oz of dry rice.
1280 calories for 2 cups of uncooked white rice + 4 cups of water. Rice Cooker White Rice recipe yields 48oz of white rice .
1280 calories for 2 cups of uncooked white rice + 2.25 cups of water. IP White Rice recipe yields 32oz of white rice.
Now, of course I used less water in the IP than I did in the rice cooker, but it's the consistency of the rice I was testing.
I've also found if I cook a big batch in the rice cooker, and it's gloopy, I freeze it in individual sized meal weights of 8 oz, and when it defrosts, I can break it up in the plastic bag with my fingers, put it in the microwave for 3 minutes at 50% and it's perfect.