Painting tilemap vs prefabs containing tilemaps

What approach is better: one tilemap (actually two: one for collidable tiles and one for non collidable using one grid) for scene painted with all platforms and ornaments OR many tilemaps with their own grids dependent on prefabs?

My team requested prefabs based on tilemaps and I am not sure if this is the right way to do it. I suggested painting entire map at once rather than using prefabs but now I don't know what to think about both options.