Since I became an Ultramind ESP instructor last June I'm reluctant to say much because I am biased

However in 2002 I wrote a longer post Sedona v Silva. You should find it using the search function (Silva & AlexK)
To me Silva is to the intellect what Sedona is to the emotions. If you want balance ultimately you'll wind up perusing both.
I originally learned the classic Silva Method and now teach the Ultramind course.
The difference. If you're not ready to explore the psychic side of your abilities the Classic Silva Method would be what I recommend you do.
If you have been exploring mediation, powers of the mind hypnosis and the like you're probably much more interested in the psychic side so the Ultramind course would serve you better.
Both courses are excellent for the basic training of entering Alpha in mere seconds. Has a handy carry over for entering the Accelerated Learning State. You can use it to pull in your focus (mentally I find) to takes that need your attention. Useful for studying, athletic training, communication and getting into contact with your intuition. Making more right guesses about things that are bothering people around you.
It combines well with Sedona.
Alex