What is the best way to: How do I sand the wall when making a magnetic drywall?

Options:
(i) Use a random orbit electric sander for most of the wall and use a manual cat shape sander for the inside corners and hard to reach places;
(ii) Use a random orbit electric sander for most of the wall and use a manual mouse shape sander for the inside corners and hard to reach places;
Answer:
(ii)