Study demonstrates a significantly higher humoral immunogenicity induced by the SARS-CoV-2 Moderna vaccine compared with the Pfizer- BioNTech vaccine.

Comparison of SARS-CoV-2 Antibody Response Following Vaccination With BNT162b2 and mRNA-1273 – JAMA

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Moderna may be superior to Pfizer against Delta variant — breakthrough odds rise with time.

[Preprint] Pfizer vs. Moderna COVID-19 vaccine effectiveness against the Delta variant in Qatar – Effectiveness against symptomatic disease due to Delta was 53.5% for Pfizer and 84.8% for Moderna; effectiveness against severe disease due to Delta was 89.7% for Pfizer and 100.0% for Moderna.