Should I opt for SEO or SMM services?

both are very important... Search Engine optimization is improving a website so that it will rank high in the search engines and help potential customers or clients find the website.

Social Media Optimization (SMO) is an Internet marketing strategy which employs social media, like online communities, RSS feeds, social news buttons, blogging and incorporates third-party community functions like images and video. Social Media Optimization differs from Search Engine Marketing (SEM) because the focus of SMO is to drive traffic from sources other than search engines.

I agree that both are important but I would focus on SEO first.