who is the most powerful

Sentry has an incalculable strength, and is a revised superman in the modern era.

Superman is a legend in all and has this as his advantage.

Silver Surfer has almost unlimited capacity and is a demi-gods.

Hulk is a beast and is "anger."

I believe that all things are equal because they are in the class of "superheroes" and even if silver surfer is a semi deity does not mean it is the best.

They are all the same :)

the only voting is compulsory?