Should I do GPT-5.4 or Opus 4.6 for Friendship and Creative Writing?

Hi, I’m having a hard time choosing between GPT-5.4 and Opus 4.6, focusing on warmth, companionship, EQ and creative writing. It doesn’t help that I don’t have access to try Opus myself before I start paying. I’m not sure which one to choose that is more emotionally attuned and expressive.

Can I get your help with this and why you’d choose one over the other?