Is your intended use only to store your images on said sites? If so, then Photobucket Pro would probably be a better option for you.
I have a Flickr Pro subscription, but I don't really sell my images. Rather, I use the subscription to upload my DSLR images to the site for my friends, family, fellow photographers and contacts to see. Without a limit to how many images I can upload in a month.
I have always see Photobucket purely as a photo storing web site. I honestly don't really use my account at all anymore. But again, if your primary use is to just store your images, then Photobucket might be your best bet.