Hulk and DD are both very different rides.
Hulk is a launching sit down coaster with a huge amount of intensity. The loops are also massive. But i prefer Duelling Dragons for one reason. THE FRONT. The front of DD, particularly Fire, is the best Roller Coaster experience I have ever encountered. The front of Hulk is pretty good as you have the wind in your face. But DD is a whole lot different as at one point it looks as if the other coaster is coming at you. Scary but the whole point is to scare you. Any other place to sit on the DD is pretty much like any other foot dangle, suspended roller coaster. Hulk is better at the back as you feel the force of the launch more. I love both, but I would say the best is the front seat of Fire, DD!!