There are a few differences between these paints:
The Classic Wall paint no. 321 is wipeable (Class 3 abrasion resistant) whereas the Plantodecor 524 is highly washable (Class 1 abrasion resistant). Wet abrasion resistance is defined in DIN EN 13 300 and divided into 5 classes. Class 1 represents the highest rating of wet abrasion, class 5 the lowest degree of wet abrasion resistance. Busy areas which can get marked easy and require regular cleaning would be best to choose the Plantodecor 524.
Both paints are very breathable but the Plantodecor 524 is more breathable as it has an sd value of 0.05 compared to the 0.1 of the Classic 321 Paint. When the term breathability is referred to with reference to paint it does not mean air, it means water, in liquid and gas form. Paints with high breathability enable moisture contained in building structures to be quickly released unhindered into the environment, avoiding things like flaking, dampness, and mould leading to a much healthier atmosphere.
The hiding power or opacity is better with the Plantodecor 524 (Class 1) versus the Classic 321 (Class 2). This means the covering power is stronger with the 524.