I would check pricing.
We utilize Google Drive as well as Dropbox. I am not for sure, but think Drive is cheaper of the two (I don't pay that bill).
I have never used OneDrive, and is actually the first program that I uninstall on new OS build. I have also not utilized the Amazon storage option(s).
IMO, would probably try Drive first. You already have 15GB if you have a Google or Gmail account. Keep in mind that stuff in your inbox counts. I am not sure exactly how they are fitting photos into your data usage as they now charge separately for that service.