Have you tried Lightbox photos or Molome with your Android and iPhone? Or you are one of those who don't have their own choices they just follow trends when there are better options available.
Lightbox photos have best picture posting. They upload your photos automatically to Twitter photo service, so your followers can view them easily within Twitter, without leaving page.
Lightbox have simple stable GUI on both applications and web.
Molome application have beautiful interesting user interface.
Molome is available for Android, iPhone, Symbian, BlackBerry, Windows Phone, Meego.