How does gta online differ from story mode in terms of gameplay?

The evidence you've provided is about Dragon Age: Inquisition, a 2014 action role-playing video game by BioWare. It describes the game's story following the Inquisitor on a journey to resolve civil unrest in Thedas and close a mysterious tear called the 'Breach' that's unleashing demons. The gameplay involves controlling the Inquisitor or companions from a third-person perspective, with semi-open worlds to explore and an optional top-down camera angle similar to traditional RPGs. This information is completely unrelated to Grand Theft Auto V's story mode versus GTA Online, so I cannot provide the requested comparison.