Is class a more important factor in language variation than geography?

Class is an important factor in language than geography depending on what language your talking about. Speaking in terms of just the English language, the classroom I feel is an important factor in language variation because other than reading a lot and being around people who speak with very sophisticated language someone most likely would not learn the different types of language there is and how to use certain words and just in general might not as learn as sophisticated language. When speaking about different kinds of languages like Spanish, French, German, I feel geography is a more important factor in language variation. In the classroom a student usually learns the language formally but without being in the actual setting where the language is spoken the student won't learn the expressions different places use and even the words that one culture who speaks Spanish uses but another culture, that speaks Spanish as well, does not use.