agree with above post,
but personally I would choose astrophysics since i find it more interesting, im not sure about whether the module taken counts towards anything when applying for further education courses at least i have not heard of anything while researching physics related courses so far. The most i have come across is that if you are allowed to choose between stats and mechanics for maths or further maths modules, assuming you do maths that is, most unis strongly reccomend taking mechanics for any applicants interested in physics.