1)Different Dante.
2)A higher conversion to its end product, DHT.
3)According to Bill (LLewelyn of MN), DHT is broken down in muscle tissues, therefore reducing (and negating) its impact on muscle growth. However, for 3-Alpha, the same enzyme the degrades DHT in the muscle activates 3-Alpha (therefore, making it more anabolic).
However, not many have used this for muscular gains, and I would think this to pale in comparison (in terms of weight gain), to 1-Test, 4AD and Boldione. So even at that, this would likely be the best option to retain size, maintain weight, while increasing strength.