A Rubber Stamp is one line only, up to 300 characters, in any font, in any rotation, and with a number of formatting options. You can also link the text that appears in a Rubber Stamp from an address list field or other fields. For more information, see About Rubber Stamps.
A Text Box is similar to a Rubber Stamp, but unlike the Rubber Stamp, the Text Box allows multiple lines of text (up to 1000 characters), in any font, but without any rotation. For more information, see Add a Text Box.