Yes, cheese quality matters a great deal, because cheese is often one of the defining flavours and textures in a sandwich. Real, quality cheese such as emmental melts smoothly and brings a genuine savoury, nutty depth that becomes part of the sandwich rather than just a filler. Many cheap, processed cheese products, by contrast, are engineered primarily for shelf life and low cost; they tend to melt into a greasy, uniform film and contribute mostly salt and fat without much character. Because a sandwich has few components and you taste each directly, the difference between real cheese and a processed slice is obvious. Using quality cheese means the cheese actually adds flavour and pleasure, instead of simply adding calories and moisture.

The best cheese depends on the sandwich, but the priority should always be real, quality cheese over processed slices. For melting builds, a cheese that softens smoothly and adds savoury depth — emmental is an excellent example — works beautifully, giving both richness and a gentle nutty flavour. For cold sandwiches, a firmer, flavourful cheese can add character and bite. The key principles are that the cheese should melt well if the sandwich is hot, and that it should contribute its own flavour rather than just salt and fat. Matching the cheese to the other fillings matters too: richer cheeses suit bold sandwiches, while milder ones let delicate ingredients shine. Above all, choose real cheese, because quality is tasted directly in every bite.