Disc ploughs are widely used in tropical agriculture where they perform the same function as a mouldboard plough. However they are not so good at total trash burial, so leave more trash poking up to the surface. This is good in the tropics as the trash reduces the speed at which water runs across the field and so reduces erosion and aids water retention. In temperate climates this is not so necessary and can be a disadvantage if you want to use ploughing as a weed control method..
Other differences
the shape of the disc produces a rounded bottom to the cultivation rather that the flat bottom achieved by a mouldboard so can reduce the tendency for panning,
better able to plough curves for contour ploughing . T
he turned furrow will be more broken, and if used at speed can get close to a seed bed.
They also roll over objects in the ground so are good in newly cleared land.
BUT they are PIGS to set it all revolves around the angles and pressure on the land wheel at the rear, that is meant to counteract the sideways thrust of the discs, its function is that of the landside on a moldboard plough..
I hope this helps, I wish you luck with it but i would advice not buying it