P4 or P5?

Hi… Now that the June exams are over, the next thing to tackle is to which papers to take.
Im hearing p4, is a very difficult paper to do… but im still not sure, can you kind folks advise me, or share with me your experiences related to the same…. i think i want to do p7..but cant make up my mind btn p4 n p5.. please kindly guide me to make the right choice..
highly appreciated.