Loam is typically considered to be the soil that is full of nutrients. It is a balanced mixture of clay, silt, and sand, which gives it good water retention while also allowing for drainage. Loam has good structure and is rich in organic matter, making it highly fertile and ideal for growing a wide variety of plants.
Clay soil can also be rich in nutrients but may have poor drainage and aeration. Sand, on the other hand, drains too quickly and generally has lower nutrient-holding capacity. So, for nutrient-rich and well-balanced soil, loam is the best choice.