Wordpress Search vs Google Search

I used to use the default wordpress search function. However, I found that the search results were rarely meaningful. Wordpress doesn’t seem to be able to distinguish which is the most relevant post. If, for example, you search for ‘Google and SEO’. It will return every post with those 2 keywords in it. However, when I search I am looking for the post with that in its title.

Rather than searching through wordpress, I found it easier to do a google search ‘Google and SEO netwriting’ would bring up the post I was looking for quicker than an internal search.

Since I stopped using wordpress my search, I assumed it would be better for reader to replace it with a custom Google search button.

• If you are a Google adsense publisher, you can easily create a google search button. As an added bonus you can get revenue if people click on the sponsored search results.
• Note: I use Google search button on several websites. I find it provides about 10% of Google adsense earnings. - Not a huge amount, but, it does add up over several months.
• If you are not a Google adsense publisher, Google allow you to create a custom Search Engine
  

Any Disdvantages of Google Search?

Sometimes new pages are not indexed. Occassionaly, not even, old pages are not indexed by Google. If you have many pages which are not indexed, you want to try and get them indexed through removing duplicate pages, and getting more links. However, sometimes I feel it is just a glitch of Google that they cannot index all pages.

Does anyone prefer Wordpress Search to Google Search?