Like many other staple foods, both rice and potato are carbohydrates, and they can give you a very large amount of energy when consumed. Rice and potato are very nutritious and contain vast amounts of nutrients such as energy, fiber, protein, vitamins, and minerals. Rice and potato are very healthy for consumption by humans and animals, your birds inclusive.
It is safe for you and very healthy to feed rice (either brown or white) to your birds, either cooked or uncooked, without causing any harmful side effects. However, it would be best if you always took caution to feed only cooked, baked, roast, and mashed potatoes only to your birds. Feeding fried potatoes to your birds could be unhealthy for them – due to the amount of unsaturated fat present in the oil.
Don’t feed uncooked potatoes to your birds because they contain many fiber and non-starch polysaccharides. Just like humans, birds can’t digest fiber because the digestive enzymes required to do such is absent. Take note that since rice and potatoes contain sugar, they’re both able to increase your birds’ blood sugar level when consumed.
Potatoes are regarded to contain more nutrients than rice due to the increased presence of protein, but it doesn’t necessarily make it healthier than rice because it also contains more sugar than rice. So the choice is yours to either feed rice or potato to your birds as both are suitable foods for them, but what I can guarantee is that both are very nutritious and easy to eat and digest for your birds.