When create a button usually i'm using 48px - 68px for the height and for the text using 16px - 18px. But, most of the time using more than 48px for the height.
Button Height: 68px Button Text: 16px
Button Height: 56px Button Text: 16px
So which one is better? 44px, 48px, 56px or 60px? I can say that all size is works, since the one who pay too much attention on button size is designer. As long the users can see the button clearly, understand that the element is button, all good.