Go for that subject which your heart and mind agrees on. I myself am a business graduate and have a good know how about the basics of accounting (I deteste it) .Instead i opted IR for my 2016 attempt
reason
1) Interest ( during my spare time i usually do study about different theories of IR)
2) A helping subject for current affairs, pak affairs, intl law, essay and to some extent us history

so my advice do not give an ear to these rumors that IR is difficult or accountancy is so confusing. Bhai go for that subject which you have a grip and interest upon. Baqi Allah malik hai, course complete hojata hai trust me.