Dropbox will give you the opportunity to invite everyone in your Gmail. I chose not to do this as with any time some service offers this method. It just feels wrong :) I prefer to send selected people my link.
If you tell Dropbox to automatically upload photos from your phone, Dropbox may give you more space if that deal is still valid. You can turn that off later if you wish and still keep the free space. I let my phone pictures sync with Google Drive because it works better for me.
Dropbox has been around forever and is not new but I am using it more and more. My box size is now 50+ GB and all free. I use Google Drive extensively also but for different reasons.
Be sure to install Dropbox on all the computers you use regularly. Dropbox becomes a folder on those computers. Then Dropbox keeps the information in that folder synchronized as well as available in the cloud and available online.
Dropbox is somewhat secure from casual prying eyes but has been hacked in the past. You can add more security in different ways. On thing I use to keep certain numbers that I would not want public is a little encrypted and password protected file called Steganos Locknote.exe. LOCKNOTE LINK It is not only a program but the file itself. When you open Locknote, simply add test like any notepad. When you "save as" you then set the password. You can rename to "mycrazyname.exe" just like any file. If you close the file with the upper right x it will keep the established password with no hassle. If you choose "save as" you can change the password.
