Cowork
I've seen posts about using chat for brainstorming and prompt creation for cowork, but in my experience cowork is great for that too. I try to be clear what I want to be done. Ask to create plan and then prompt for the task and then leave the unclear things for me to confirm. Even if the documents and source is large(multiple pdfs each 10+pages)it still capable of creating good outputs. And I don't use opus for that. Sonnet is great with creating the prompt and then execution.
I've only started using Claude especially cowork and I'm still new but if task is clear Claude is best for doing the job and if not clear just asking and figuring out on the way works too.
Also I've been reading courses from Claude and that helped a lot too.
If u guys have other tips I'm glad to hear.