Which foldable panel would generate more: One 400W or Two 200W?

Looking at getting a portable, foldable solar panel/s plus battery set, and wondering - which would be better: one 400W foldable panel, or two 200W foldable panels? I can use 30 ft extension cords with them. My thinking is that two 200W may be more flexible in terms of being able to set them in two sunny spots instead of being restricted to one, unless you think the 400W panel will generate more. Weight for transport is about the same between one 400W and two 200W. One advantage of two 200W is that you can take just one when you don't need two.