Cold starts just got hot

Engineering report from Neon's effort to reduce cold starts on its Serverless PostgreSQL Platform

Hello! From your perspective, how does Neon compare with Planetscale's offering? (Beyond the core MySQL vs Postgres differences)

If someone has a bit of experience with both MySQL and Postgres and isn't attached to either, is there a differentiating factor between Neon and Planetscale offerings?

Or are they close enough that it's essentially a MySQL vs Postgres decision?