The size at which a wine glass counts as large
The grape shapes the glass more than the capacity does. Pinot noir and other Burgundies call for a wide, rounded bowl that tapers towards the rim, like the 96 cl Definition Burgundy glass from Spiegelau; that shape collects the delicate aromas that would otherwise drift away. Bordeaux, cabernet and syrah are heavier and want a taller, slightly narrower bowl, which is exactly what the 55 cl Supremo Bordeaux from Luigi Bormioli and the 64 cl Symphony from Stölzle Lausitz are built for. If you are not sure, take a universal glass of 40 to 47 cl such as Open Up from Chef & Sommelier.
Then comes the question most people are really asking when they go looking for large glasses: how strong is this? On thin crystal bowls the weak point is the stem, not the bowl, and a short thick stem is clearly more robust than a long slender one. Machine-pressed glass with a reinforced stem join, like the hospitality ranges from Chef & Sommelier and Stölzle Lausitz, survives a restaurant dishwasher for years. If you want thick-walled glass that can take a knock, look at the heavier models with a solid foot.