Roasted Peppers, especially poblano peppers, is a staple of Mexican and South American cooking. For classic recipes like rajas and chile relleno roasted poblanos are absolutely essential to recreate restaurant level flavor!
Of course, poblanos taste great sautéed but you just can't beat the sweet, smoky, silkiness of roasted peppers.
You can fit a lot of peppers on a baking sheet and bake all at once...but its more of a pain to de-seed and de-stem cooked peppers.
This tends to be a more time consuming method since you have to keep your eye on it the whole time!