Assuming it is not a false choice.
Is there any evidence that a soda tax actually curbs soda consumption (much less overall sugar consumption)? Or does it just hurt people, disproportionately poorer people who can least afford more tax, by sucking more money out of their wallets and potentially causing them to cut back in other areas -- like perhaps their fruits and vegetables?
That's an honest question. I haven't looked for any research about whether or not it has any positive effect. I'm merely pointing out that the act of creating an economic disincentive does not necessarily get you the results you hope for.