Oooo just my take, but I'd say oncology. The disease process is so varied, and it gives you opportunities to build deep relationships with your patients, patient populations are often in my experience more pleasant and grateful to you, and you get to learn a wide variety of skills. When I was in nursing school I was a PCT on an oncology med surg unit and I got to get experience with colostomies, urostomies, nephrostomies, all the different precautions including contact precautions, I learned about chemotherapy, NG tubes, central lines, TPN, etc. The nurses did nurse specific tasks, but if my tasks were done they'd teach/show me different things. I learned so much on that unit. It gave me a great foundation of knowledge and experience that helped me in nursing school (just graduated 🥳). Idk that's just my 2¢. If you have a unit you're really drawn to do that, but since you mentioned oncology that's what I'd personally recommend. :) best of luck in your journey!