I have worked on large and small projects with both in-house and outsourced teams. Each time, a host of variables impacted the "correct" decision.

That said, I think it would be hard to answer this question without having a better understanding of what the app is, the delta between the MVP and the vision, your ability to document / communicate your goals (functional or otherwise) to an outsourced team, how you define "better," etc.

In short, it depends.

TL

P.S. Love reviewing apps and would be happy to beta test / provide feedback if you're willing to share. https://clarity.fm/toddlevy (First time's free.)