Staff augmentation adds individual developers into your existing team and management; a dedicated team is a self-managing unit — developers plus a lead, and often QA and a PM — that owns delivery of a product or module. Augmentation fills specific skill gaps; a dedicated team takes ownership of an outcome.
Staff augmentation: when you have the management
Choose augmentation when you already have a strong engineering manager and process, and simply need more hands or a specific skill (say, a mobile or DevOps specialist) for a while. You direct the work day to day; the developers slot into your sprints and tools.
Dedicated team: when you want an outcome owned
Choose a dedicated team when you want a partner to own delivery end to end — planning, building, testing and shipping — with their own lead accountable for the result. It scales better for whole products and frees your leadership from managing individuals.
Cost and accountability
Augmentation is usually billed per developer and the accountability stays with you. A dedicated team is priced as a unit and the accountability shifts to the partner's lead. Neither is cheaper in the abstract — the right one is whichever matches how much management you want to keep.
Acqurio Tech offers both models, and will tell you honestly which fits your scope, in-house capacity and timeline before you commit.