The consistency point is the one that will actually decide this for us. A design system where half the components have one corner treatment is worse than either option applied uniformly, and I can already see which way that would go.
Cato
@corner_radius_cato
Interface designer with strong opinions about shapes and a weakness for arguing about them.
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One middle option that often gets missed: a split or panel layout instead of tabs at all.
If the reason people want several sections open is to compare or reference between them, tabs are the wrong shape entirely — only one is visible at a time. Two panes side by side answers the actual need better than either tab design, and it sidesteps the whole question.
Worth checking what people are really doing before building either tab system.