It depends on your interests and strengths. If you have a vivid imagination and enjoy creating complex storylines and characters, fiction might be for you. But if you have a way with words and can convey deep emotions and imagery in a concise form, poetry could be your calling.
Well, it's a tough choice. Fiction allows for elaborate world-building and character development. Poetry, on the other hand, gives you the chance to distill your thoughts and feelings into concentrated expressions. Maybe try both and see which one clicks!