SEO comparison, does either platform rank better?

Neither platform guarantees better rankings. Compare the ability to maintain useful content, crawlable internal links, relevant redirects, canonical URLs, sitemaps and accurate structured data in your actual implementation. Review existing search landing pages before changing URLs. During a migration, map each useful old page to a relevant destination and test it. Content quality and the implementation matter more than a blanket claim that one platform receives a ranking advantage.

Official references: Google SEO Starter Guide.