Diff between typePad, SquareSpace, and WordPress?

Meanwhile, can anyone tell me the differences between WordPress, SquareSpace, and TypePad? TypePad seemed real eazy to operate and readily keeps things formatted (itals and so on) when cut and pasted into its pages (WordPress seems to lose all the ital and other formatting), and TypePad brings in pictures, too. Squarespace seemed like it was next gen but I wasn’t so eager to mess with it. TypePad templates on the site anyway seem kind of grim