Flat-rate cash back cards apply a single rate -- commonly 1.5% to 2% -- to every purchase regardless of category, offering maximum simplicity at the cost of leaving higher category-specific rates on the table for spending in areas like groceries or gas.
Category-based cards offer elevated rates -- often 3% to 6% -- in specific spending areas, but require either sticking to a single dominant category card or managing multiple cards to cover a household's full range of spending categories effectively.
The practical break-even consideration is spending predictability: a household with highly variable, unpredictable spending across many categories often does better with a flat-rate card's simplicity, while a household with a few large, consistent categories (groceries, gas, a specific recurring subscription) can meaningfully benefit from category-specific cards matched to those exact expenses.
A hybrid approach -- one flat-rate card as a catch-all combined with one or two category-specific cards for the largest recurring expenses -- is a common middle ground that captures most of the category-based upside without requiring the complexity of a full multi-card rotating strategy.
Ultimately, the choice isn't universal: it depends on individual spending patterns, tolerance for tracking multiple cards and categories, and how much marginal cash back is worth the added complexity for that specific household.
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Neither is universally better -- it depends on spending predictability and how much complexity a cardholder is willing to manage for higher rewards.
Yes -- a common hybrid approach uses a flat-rate card as a catch-all alongside one or two category-specific cards for the largest recurring expenses.