Claude premium or Chatgpt Premium for research?

I am in my final year of Uni, have to do my research on solar panels for homes but in my city's climate which is in sulaimany.

I checked out Elicit and scihub but since my research is focused on my city which it had nothing on, I am thinking of just using an LLM to help me with writing it.

So which one is better for this type of work?