I just answered the same questions on Twitter [1], so just quoting that:
Neon is a lot more feature-rich right now (since PPG just came out) and has awesome stuff like branching.
On the long-run, we expect to have a similar feature set. Additionally, our underlying tech has the benefits of avoiding cold starts and likely being more cost-effective.
That being said, I see it as a major benefit that with Prisma you not only get a DB but an entire data layer (incl global caching and real-time DB events) thanks to the first-class integration of our other products like Accelerate and Pulse [2].
