Your choice should be based on knowledge gained at the Foundation Level. You should have read the Examiner’s report which will surely help with your decision. I think the Examiner said that if you are an auditor you will find P 7 easier. However browse the syllabus guide and it will help. if F8 was easy for you then select P 7. Each paper has it own challenge, but it how you apply yourself. Best of luck in your selection.