Suzanne Dimma, Hilary Smyth and Meg Crossley weigh in on the best sofas with timeless appeal. Several H&H staffers own a William Birch-style sofa — its low arms, curved back and slipcover options make it a classic choice that complements both modern and traditional styles. A sleek and simple option, the tuxedo sofa also suits various styles, but is more streamlined — dress it up with your own throw pillows or upholstery.