Sedumroof are the same as extensive greenroofs. They are called like this because of the low maintenance. It's also the lightest and cheapest system for greenroofs. Sedum is perfect for in the sun.
Herbroofs can have a huge variation of plants that can be used. We work mostly with evergreen and nice flowering plants with a total height of max 40cm. This kind of roof weighs a little more and there is more maintenance.
You can also make a living space of your roof. You can use various kid of plants combined with a terrace and even a small waterpond. You have to make sure that your roof is strong enough for the total weight and there is also more maintenance.