I used jotun before. Also Nippon paint. Jotun matt is more matt than Nippon.

The jotun super matt is a new product. Haven't try it yet.

The question you should ask yourself is whether you really need to have super matt in that particular room.

I'm satisfied with true beauty matt in the living room. In kitchen, I selected true beauty sheen for more smoother wall (for easy wiping), more reflection making it more brighter during daylight.

I painted the walls myself, ok no problem with true beauty. For the newer super matt product, the key info given is that the drying time is 4 hours. True beauty is only 2 hours.

Price different would be another factor for me. How much different btw them in 5 litres can?