Executive summary
Dropbox and Google Drive are the two most recognisable names in consumer and small-business cloud storage, but they were built to solve different problems and that shows in every category we test. Dropbox was founded on a single, hard engineering problem — keep files synchronised reliably across every operating system, no matter how large or how often they change — and it has stayed focused on that problem for almost two decades. Google Drive was built as the storage layer underneath Google Workspace, and its value proposition has always been collaboration and cost, not sync purity.
That difference in origin explains the entire shape of this comparison. Dropbox wins convincingly on sync reliability and large-file handling; Google Drive wins convincingly on price per terabyte and real-time document collaboration. Security posture is broadly comparable and neither offers default end-to-end encryption, so that is not the deciding factor for most buyers. The decision comes down to which failure mode you would rather avoid, and how much you already depend on Google's productivity suite.