The clip system holds the module mechanically: a formed clip engages the module edge and the module is pressed home. It is fast, it is firm, and it gives a tight, consistent joint line. Removing a panel takes a tool and a deliberate action, which is exactly what you want on a public corridor where panels should not come off by accident.
The magnetic system holds the module with magnetic fixings and a top track that limits and locates it. It is faster still, needs no tool to open, and is the right choice where access is routine: riser shafts, electrical cupboards, access panels behind sanitaryware, plant rooms. The trade-off is that a magnetic fixing has a lower resistance to being knocked off than a mechanical clip, so it is not the right choice at trolley height in a hospital corridor.
Both variants share the same 33 mm module, the same 38 mm minimum thickness and the same 17 kg/m2, so the choice does not affect the wall's acoustic or fire performance; it affects only the access strategy. That means the decision can be made per wall, or even per panel, on the same project.
The practical rule: clip where the wall is public and permanent, magnet where the wall hides something that gets serviced. Draw the access strategy on the elevation — mark which panels open and how — and the maintenance team will use it correctly. Without that drawing, they will cut the panel.