Whether Estoril or Cascais is "better" depends on your preference for atmosphere, history, and nightlife, though in 2026, the two are so close together (just 2km apart) that they are often visited on the same trip. Cascais is widely considered the superior choice for most vacationers because it is a more "complete" and lively coastal town; originally a royal retreat, it features a charming historic center, a busy fishing harbor, a pedestrian-friendly marina, and four accessible beaches right in town. Estoril, by comparison, is more residential, stately, and sophisticated, famously known for the Casino Estoril—one of Europe's largest—which inspired Ian Fleming's James Bond novels. While Cascais offers a wide variety of restaurants, bars, and museums (like the Paula Rego art gallery), Estoril is quieter and more "grand," with its primary highlight being the Praia do Tamariz and its proximity to the casino's entertainment. Most travelers find that Cascais makes a better "base" for a holiday due to its direct train connection to Lisbon and more extensive dining and shopping options, while Estoril is a pleasant, upscale stop on the scenic seawall promenade that connects the two towns.