For our OCR A2 coursework, we all had a free choice in French - I did "Les privileges du president - s'interesse-t-il a sa propre vie plus qu'a celle de ses citoyens?" . In German I did mine on the play Die Physiker, which has been made into a film like those French ones - so the choice that you get is reeeeeally huge hehe.
When I see what people I know at other schools doing OCR A2 languages are doing, I sometimes feel the teachers are pushing them too hard, often making them do heavy literary essays with tons of literary analysis - my french one was basically nothing more than a longer version of the kind of thing we might get asked to do for homework, quite light and easy to read, and I got 59/60 on it. In German, yes it was literature, but a few quotes and not too much hard work (apart from the whole writing-in-German aspect...lol) an i got 58/60. Unlike my friend who wrote pretty much an entire critique on l'etranger lol, and only got 49/60.
Basically, chose something that YOU are comfortable with and that you are truly interested in - it'll be so much easier and i guarantee it would be better!