I can talk about P4 being a beast but recently P5 has become notorious for lowest pass rates, this session it has 28% while P4 has 34%
I took P4 with P7 and found it a nice combination. People say that if you did well in P3, P5 would be less difficult as they’re somewhat related.
P4 is challenging and very time pressured, its technical while P5, I believe, is more discursive. I’ll leave someone experienced with P5 to guide you. If you do proceed, you will find P4 similar to F9, but of course more advanced.
I have heard that the same cant be said about P5, its nothing like F5, I might be wrong though