tedster - 11:10 pm on Dec 10, 2012 (gmt 0)

The shorter, 2-word phrase is much more competitive and a lot harder to move. It's generally easier to get traffic for the longer phrase that CONTAINS the shorter phrase and then, over time, there's a better chance that you also begin to rank for the shorter, more desirable phrase.

Just don't try to do it all with internal anchor text alone - you will usually get penalized at some point along the line for that.