SSO is probably the only thing. Other than that, no idea. Netlify pulled the same stunt with us and we left. They must have burned many bridges by now.
That's not a fair comparison. Looki at Netlify[0] and Vercel's [1] pricing sites, the per-user pricing for the "pro" tiers is the same and Vercel gates the features that are in the Netlify "business" tier behind an enterprise contact-us paywall.
I suspect that if you're using these "as expected", your bill on both sites would be the same.