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Underwire versus softcup is a bra battle that will continue to span generations. Underwire bras are those that provide additional lift for your breasts and give great support. Softcup usually focuses on comfort and also gives lift and support, but in a less dramatic fashion. Size definitely matters when it comes down to the choice between the two; larger sizes benefit from the shaping quality of an underwire and smaller sizes often find wirefree to be more comfortable with better lift for their smaller breasts. Most people simply have a mix of underwire and soft cup bras and wear both depending on the outfit.
A good rule of thumb to determine which one works for you is: B cups and up look better in underwire bras; A cups generally do better with soft cups, with the exception of cleavage baring outfits.