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AlternativesThe difference that decides most briefs is not quality. Above 720p, Veo 3.1 has exactly one duration — and that constraint is in Google's own parameter table.
AlternativesThe Seedance people put against H3 is 2.5 — which has no published rate above 720p and no score on any public blind-test board. That is a planning problem, not a quality claim.
AlternativesThey are not competing products. Same company, released two months apart, one letter apart in the API string — which is most of why people mix them up.