Both boiled and baked potatoes are pretty healthy but baked potatoes would be the healthiest of the two.
When you boil potatoes in water you remove some of it's good nutrients that are essential for overall health but when you bake the potatoes instead the nutrients stay in the potatoes.
Baked potatoes also provide 6 grams of protein and 6 grams of fiber and contains 25 percent more magnesium than boiled potatoes.