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Thank you guys, both good answers. I just watched the video, good stuff. Then responsive design is the way to go.

Excellent points and advice, thanks everyone for answering.

Thanks Takeshi Young and seom2014.

All of the SEO tools help you to conduct research and analysis to enable you to make decisions when doing onpage and offpage optimisation.  The purpose of the tools is to help you make the best decisions based on insight so you can improve your sites performance. There's the answer.  The tools combined with an investment of time and carefully study - they apply what you learn - are what you need.  No magic bullets. Even if you learn everything and apply it perfectly you might not have success.  The reason is that - at difficult levels of competition, SEO becomes a battle of resources.