Strasbourg is the historic capital of Alsace, but Alsace is the whole region around it — a patchwork of wine villages, a hilltop castle, and museum towns that no single city visit can cover. Comparing them means comparing a city trip to a regional road trip.
Strasbourg is a single city built around its Old Town Around the Cathedral and Petite France District, walkable in a day or two. Alsace is the entire region: Strasbourg itself plus Château du Haut-Koenigsbourg, wine villages, and museum towns spread across dozens of kilometers, needing a car or train to see properly.
Strasbourg's Strasbourg Cathedral anchors the city, its Cathedral Astronomical Clock Demonstration drawing crowds daily, alongside Palais Rohan and the Covered Bridges (Ponts Couverts). Alsace's landmark list adds something Strasbourg alone can't: the hilltop fortress Château du Haut-Koenigsbourg, rising above vineyards rather than the river.
Strasbourg's Musée de l'Œuvre Notre-Dame covers the cathedral's own art and history, set within the storybook canals of Petite France (Medieval Quarter). Alsace broadens the scope hugely, pairing Musée Unterlinden in Colmar with Mulhouse's Cité de l'Automobile and Cité du Train, plus Colmar's own canal district, Little Venice (La Petite Venise).
Strasbourg's only real escape is Colmar (35 km), itself a gateway to wine country. Alsace turns that single day trip into the main event, built around Eguisheim and Riquewihr, best explored through organized Alsace Wine Route Tours rather than a single afternoon out of the city.
Choose Strasbourg for a compact, walkable city break centered on the cathedral and canals of Petite France District. Choose Alsace for a slower road trip through Riquewihr, Eguisheim, and Château du Haut-Koenigsbourg. Most visitors base in Strasbourg, day-tripping into Alsace.