I've just made a flickr account, and since I've been uploading pngs rather than jpegs, my photos don't have all the exif data, and so I would like to replace them, but with the free account, I'd have to delete them all and reupload, loving favourites, views etc.

So I have the possible option of upgrading to the pro account, which isn't a lot if I pay for a year/2 years in one go.
However if I'm looking to get more serious about uploading etc, wondering whether anyone would recommend a different service? Such as 500px.

Would people say stick with flickr and upgrade to pro? Or do something entirely different?