While both are used, "as" has a stronger connotation of causality. As @InitK's comment points out, "as" is being used to explain why we are listing properties of X.
I would state it as:
We list the Ys of X, as this will be useful later in calculating Z.
Since you're already mentioning that these properties will be used later, I would introduce what their eventual use will be.
Generally, I would avoid using "and" as a conjunction when possible:
I insulted him, and he punched me.
I insulted him, so he punched me.
The former makes the connection between the two event (insulting and punching) weaker. "So" conveys the connection more strongly.