I should clarify: it is not once-blooming vs perennial, it is once-blooming vs. re-blooming. Roses are perennial, although some are not reliably hardy in our climate (although you won't generally find those on sale here).

One reason the David Austen English roses are so popular is that they have the look of old-fashioned roses, but the re-bloom of modern roses. Right now my Abraham Darby and Othello and Graham Thomas are to die for.