Scotch ale and Scottish ale: the same family with different alcohol content
Both are ales from the same family, but Scotch ale is usually stronger than Scottish ale, a difference that is worth knowing before choosing.
“tends to be given to more session-able ales of the same family. These are typically made in their namesake region, Scotland, but not always. If you see”
In very basic terms, "Scotch ale" and "Scottish ale" once meant the same thing. Today, the label "Scotch ale" usually indicates a stronger beer, while "Scottish ale" applies to lighter beers in the same family. Both are typically brewed in Scotland, though not always: if the label says "Scotch-style ale," the beer comes from another region, usually the United States.
Both belong to the same beer family: ales. They use ale yeast, which rises during fermentation, so these beers ferment at the top of the fermenter at or near room temperature. These are important differences compared to a lager, and although Scotch ale and Scottish ale are not identical, they share the same general classification.
Within this subgroup is also wee heavy ale, which is essentially a version of Scotch ale, generally stronger and with a much more pronounced malt flavor. One could argue that they are the same, but they are usually distinct enough to warrant a distinction, especially in their native Scotland.
The glass matters when serving them. A tulip glass works for almost any beer, but traditionally Scottish beers are served in a thistle glass, which is narrower than a tulip and has a rounded, bulbous base. If you can't find one, a tulip glass will do just fine.
With food, milder Scottish ales pair well with savory snacks like pretzels or chips, and also with comforting dishes like macaroni and cheese. Stronger, more robust ales complement root vegetables and roasted poultry, and can be a good match for rich cheeses and meats on a charcuterie board.