Mathematics vs economics degree

Which degree is more valued?

I could do honours in either, but the math route at my uni seems to be about twice as much work, which is pissing me off. I prefer math but is it worth busting my ass for?

Depends on the degree. Where's it from? What university? Generally  speaking, a degree in mathematics alone isn't "worth" much. Pair it with computer science or something and that's a different story.
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These anons are rights though. Do what you love and everything else will work itself out.