Neither is really better for analytics out of the box. Both Neon and Supabase are built on Postgres, and neither includes a full data visualization or dashboarding layer for your application data.
Supabase adds logs and infrastructure monitoring on top of Postgres. Neon focuses on serverless scaling and branching for Postgres. Both leave the actual analytics on your data, dashboards, charts, and reports, up to you.
Because both are standard Postgres, a tool like Draxlr connects to either one the same way, so you can build dashboards, schedule reports, and set alerts regardless of which one you choose.