I have a Lansky Master Edge. Don’t own a Sharpmaker. Lansky is 17 and 20 per side, while Sharpmaker is 15 and 20. Lansky also has 25 degree slots. The SM fine is finer than the Lansky. That aside, I would think they would be about the same. SM has courser stones available. I have found some 220 grit rods that will fit the Lansky, but have not ordered them yet.
You could probably get by with either, but if I were to do it again I would probably go Sharpmaker.