Should text in button be bold?
This also depends on the font type. You'll find that some fonts are specifically designed to include Light, Normal, Bold, Heavy and other weights, while others are not specifically designed like this. In general styling the buttons themselves will draw more attention than the font. There is no 'better'.
How do I change the font on my button text?
The font can easily be changed by targeting the button with CSS and then using the “font-family” property.