SEO and SMO both are imporatnt for the Business. As SMO social media optimization creates brand name of your business on social networks and Search engine optimization provides you identity/presence on search engine rankings.
And specificly you want both of them one then i would like to go with SMO, Because social media like facebook, twitter, linked in consist of great traffic which is beneficial for us. In todays internet world peoples are 24*7 available online and search the things online. So that u can target your audience easily on social networks.