Google keyword planner VS Google natural searches

[anfeng3]

Analysis these keywords: A, B, C by Google keyword planner, found the follwing results:

A: monthly searches 4400, competition 1
B: monthly searches 2900, competition 0.82
C: monthly searches 390, competition 1


Type the follwing keywords in Google, the natural search results:

A: 1.4 million
B: 0.4 million
C: 5.6 million

The above two results seem to be contradictory......

If choose one of them as main keywords of my website, which one is the best?

[Andy Langton]

Type the following keywords in Google, the natural search results:

That number is an estimate of how many pages use all of the words entered (in any order). This is unlikely to be a good measurement of competition. You can refine this somewhat but checking for more refined criteria, e.g.

• As a phrase - "my phrase" [google.co.uk]
  
• Within a title - intitle:my phrase [google.co.uk]
  
• As a phrase within a title - intitle:"my phrase" [google.co.uk]

However your mileage may vary.

Look at it another way. There are lots of results for "untitled page" (where people forgot to add a title). Is this a competitive phrase? Not really - no-one is trying to specifically to rank for those words. If you need a high degree of accuracy, you'll need to look at more complicated methods.