No one can really say which is one is better between marketing and branding but it will be generally acceptable to conclude that social media marketing will surely lead to branding.

When a company has made its feet stood on social media, it is possible that such a company will easily build a platform and name for itself. That's why it is better engage in rigorous social media campaign to get the branding done easily.

Branding drives customers easily. A branded company will not struggle looking for users and customers. But it all starts with social media marketing.