Physics is highly regarded in finance circles - a lot of graduate physicists end up in the city. Physicists are good at developing and handling abstract mathematical models which is exactly the skill needed in finance these days.
My maths teacher (who did maths at Oxford) used to be a stockbroker and he did Maths, Further Maths and Chemistry.
Let me repeat: he ended up teaching. I'll allow you to draw your own conclusions.
Seriously, I'd say Physics - it's more 'numerical' and is probably better linked to Maths and Economics... more problem solving... although chemistry is probably more 'exciting' in that you get to do fun experiments and make slime as someone said.