Which PPC tool gives you Best result?

Guys,
Lets discuss which PPC tool gave you best result for your PPC campaign.
There are many tool like speedppc, Efficientppc, Adword accelerator,ppc-coach etc available.
But which one can help you better if you are promoting a lot of products by ppc campaign and you need to manage all of them and also their bid, costs etc.
How to do that efficiently.
Comments will be appreciated.

See original post by bluebelt91