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Building your own team delivers the most control. The people absorb the business domain over time, and that knowledge sits inside the top react native development company. The price comes in the form of a long ramp-up and fixed costs: hiring well is slow, getting someone productive takes several more weeks, and the payroll keeps running regardless of workload.
Project outsourcing implies someone else is accountable for shipping: the partner staffs the project, the partner manages the process, and the provider carries the staffing risk. The model works when the outcome can be described and your side has a decision maker with time for vue or angular it. It fails when there is no one to answer questions, as the provider is not able to invent your business rules.
dedicated development team vs outsourcing extension sits between the two: you bring in developers while keeping responsibility for delivery on your side. It moves quickly — a suitable engineer can start far sooner than a new hire — and it scales down as easily as it scales up. The trade-off is that your engineering managers need the capacity to direct the work. If that capacity is missing, you end up paying hourly for uncoordinated work.
In the real world, the models mix. A common pattern holds the architecture and the core domain in-house, while an outside vendor handles the parts that are bounded and specifiable. The rule is simple enough: keep the parts that are hard to re-learn, and outsource what is well understood.
A few questions generally decide the matter. To begin with: is what you are building a core competitive asset, or internal plumbing? Next: how long will you need this capacity — a quarter or custom automation software development a decade? Finally: who owns it once the vendor leaves? Work through them with real answers and the model becomes obvious.