Learn Spanish (Latin America): Es lógico que busques no solo comodidad, sino también buena gastronomía. - It is logical that you look for not only comfort, but also good cuisine.

You use sino que when the second part of the phrase introduces a new conjugated verb. In this sentence, you are just connecting two noun phrases (comodidad and buena gastronomía), so you only need sino.

Why is the verb busques in the subjunctive instead of the indicative buscas?

The sentence starts with Es lógico que (It is logical that...). This is an impersonal expression that states a subjective opinion or value judgment, which always triggers the subjunctive mood for the following verb (busques).

Why don't we need definite articles before comodidad and buena gastronomía?

When talking about seeking or consuming uncountable things in a general sense, Spanish often drops the article. Since you are looking for comfort and good food in general—rather than specific instances of them—the articles are left out.

Does gastronomía just mean "gastronomy"? It sounds very formal in English.

While it translates directly to "gastronomy," gastronomía is used much more commonly in everyday Spanish to simply mean the "cuisine," "food," or "culinary options" of a place. It doesn't sound overly academic like it often does in English.