Hi I’m studying Advanced English aswell as for portfolio writing there is argumentative where you list the pros and cons of the argument however you have to keep it balanced which can be difficult as sometimes you can find your self leaning to a specific side of the said topic which can make it sound more persuasive when it’s not supposed to be
Then there is persuasive where you try to persuade the reader to your view this can be done by using techniques such as rhetorical questions and puncturing ect
Then there is creative writing where you can write a short story about a character and there surrounding/situation using creative techniques such as metaphors , personification, punctuation etc making the character more interesting however make it a short story as there is a word count and you can make it too complicated
Then there is reflective writing where you write about a experience you had and what impact it had on you like a holiday but write it creatively using the same techniques and it is written in first person (I run ) I did this one for Nat 5 and Higher
However the discursive writing there is more stuff they mark you on compared creative writing and the more stuff they mark you on the more they can catch you out and down grade (look at marking scheme) you but play to your own strengths if your good at writing discursive then maybe choose that one . hope this helped good luck with writing it 💪