Which that should be trusted most? Wordtracker or Google Adwords Tool?

I use both wordtracker and Google Adwords Keyword Tool to seek the demand (Search Engine search) on keyword or phrases.

Both often have different result.

My gut feeling says that I should trust Google Adword Tool better, because it provides us the demand (SE search) on a keyword up until last month...beside the tool come from Google itself.

What do you think?

 

I would also go for Google Adword tool...the fact that it is more reliable is proven by my own personal experience

 

As Google Adword tool is the best and I am using for keyword analysis.

 

I trust Google Adword tool! I have been using it for a long time and it really works!