You can pair your Samsung Galaxy with your iPad. You can't use it to send files/pictures/music, though.
As you already noticed, you also can't delete pictures you synced to your iPad through iTunes.
You could use cloud storage, like Dropbox, Google Drive, Skydrive, Box, ... to sync between devices. Save the files... there, and you can open it on the other devices as well. There's also Evernote, which syncs between Windows and Apple as well. I wouldn't use it for pictures, though.
Another option would be to use software on your computer to sync iPad and computer. There are several different kinds of these available for Windows and Mac. Just search for them and choose the one that fits your needs.