In Maths A level you can do two statistics modules within it. I guess it would depend on what you want to do in the future, as in general I would say maths is more useful as it will open up many courses to you- it is a facilitating subject. I haven't really heard much on statistics- it isn't offered anywhere near me. Looking online I can't see anything suggesting it is a 'soft' subject. If you want to do something science-related I would recommend maths personally.