You can use either as DJI cameras embed GPS location data in the exif tag. I would recommend using the new method, "Optimized for DJI Cameras" cus that's what you are using! If, for some reason, you have difficulty, then simply close out of the page and then go back and use the Classic upload version.
I would add; To start, use a subset of your images in order to make use of the free map solution. That way you don't have any stress of paying for your learning. When you are comfortable with the process, then give it a go with the whole set.