Kitten vs Cat food... depends on the age and health of your hedgie.
In general, I'd say high quality cat food.
But if hedgie is a baby or otherwise having difficulty eating big pieces, then something like Royal Canin Baby Cat kibble might be helpful. In addition to size, a big difference between kitten and cat foods that I've seen is the amount of fat.
My quilled ones are on adult cat kibbles - "light," "healthy weight," or "indoor cat" versions depending on the brand... particularly for my full-figured lady. Tex gets a little more of the regular kibbles thrown in as he's just a little fella.