"Baked potato" can mean three genuinely different textures depending on which appliance does the work. None of the three methods is universally better; each is the right tool for a different priority.
All three methods work best with a starchy variety, Russets specifically, since their high starch content is what produces the classic fluffy, dry interior a baked potato is known for. A waxy potato baked the same way comes out denser and less fluffy, regardless of method.
Scrub potatoes clean and pierce several times with a fork, which lets steam escape during cooking and prevents pressure buildup. Rub the skin lightly with oil and salt if a crisp, seasoned skin is the goal, then bake directly on the middle oven rack (not on a baking sheet, which traps heat underneath and can steam the bottom) at 400-425°F for 45-60 minutes, depending on size. The oven produces the best skin of the three methods: genuinely crisp, well-browned, and worth eating rather than discarding. The tradeoff is time; this is by far the slowest of the three options.
The same prep applies, scrub, pierce, oil and salt if desired, then cook at 400°F for roughly 35-45 minutes, turning once halfway through. The air fryer's concentrated, circulating hot air gets remarkably close to oven results in significantly less time, with a skin that's nearly as crisp as the oven method, sometimes even more so on smaller potatoes where the air fryer's compact space concentrates heat more efficiently. This is generally the best balance of quality and speed among the three methods.
Pierce the potato several times, then wrap in a damp paper towel, which helps steam the potato evenly and prevents the skin from drying out and toughening unevenly. Microwave on high for 5-8 minutes for a medium potato, turning halfway through, then let it rest for a couple of minutes before cutting, since the interior continues cooking briefly from residual heat. The microwave is by far the fastest method, but the skin comes out soft and leathery rather than crisp; it's the right choice when speed is the priority and the skin isn't going to be eaten.
A common trick for the best of both worlds: microwave first to cook the interior quickly, then finish in a hot oven or air fryer for 10-15 minutes just to crisp the skin.
Across all three methods, the same test applies: a potato is done when a knife or skewer slides into the center with no resistance. Squeezing gently (with an oven mitt, given the heat) for a slight give is another common check, though it's less precise than the knife test.
Never microwave a potato without piercing it first. Steam builds up inside an intact potato skin quickly under microwave heat, and without an escape route, that pressure can cause the potato to burst, sometimes forcefully, inside the microwave.
For serving ideas once the potato is done, see Baked Potatoes with Olive Oil and Jacket Potato with Apple Coleslaw, or the broader pairing guide at What to Pair With Potatoes.