I strongly advise that you embark on the philosophy course.
First and foremost, it is very interesting and broadens ones' horizons and makes one think beyond the scope of thinking held by society. If you are a person who delights in gaining new knowledge and becoming extremely intelligent and clever, such as I am, then philosophy will encourage one to research more into different aspects of life etc.
Secondly, philosophy is deemed a 'traditional' subject, whereas Business Studies, as opposed to its familial subject Economics, is not classed as a 'traditional' subject, I think.
'Traditional' subjects give one more of an advantage in university applications than non-traditional ones.
Furthermore, and last of all, I have recently commenced the A2 course and I do think that it is highly interesting, not to mention the refreshing set text of Nietzsche.
Philosophy of the mind will be particularly interesting in A2, as you only touch on a small part of it in AS.
Take philosophy - it will be of more value and worth, not just to your overall life, but in your university appplications (that is, presuming you achieve good, if not top marks in the exams!
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P.S. I also recommend that you inform yourself of both specifications in both subjects and ask of others opinions, as you so rightly do now, and then finally make an informed and confident decision.
By the way, the school year is under way now, no? Does your college allow you to choose subjects this late?