Using different milk does not affect the fluffiness and lightness of the bread. The coconut milk I used was the "Ayam Premium Coconut Milk 100 % Natural" which contains 24.3 g fat in 100ml and it is quite rich and thick. The almond milk that I used was "Sanitarium So Good Almond Milk" and contained only 1.4g per 100ml. It was very thin milk. The almond milk bread turned out fluffier and coconut milk bread was denser. Hope these experiments using different ingredients helps you make a decision as to which ingredients to use.