Which glass is suitable for drinking whiskey neat or on the rocks?

The Old Fashioned glass is highly suitable for drinking whiskey neat or on the rocks due to its design and characteristics. This glass typically has a wide, sturdy bottom and a short stature, which allows for easy swirling of the whiskey to release its aromas while also accommodating ice if desired. The shape and size of the Old Fashioned glass enhance the whiskey-drinking experience by allowing the drinker to appreciate the color and texture of the whiskey, as well as its complex flavors.

Moreover, this glass is conventionally used for spirits served in a straightforward manner, making it a classic choice for enjoying whiskey without mixers, showcasing the spirit's true character. The design also accommodates a traditional whiskey serve, whether it's over a large ice cube for dilution or neat, offering versatility depending on personal preference.