The Hulk has a lot of force in the back.
Duelling Dragons Fire - Go for the back left seat
Duelling Dragons Ice - Go for the front.
Go for the Hulk and Spiderman early morning. Get multiple re-rides if desired/possible. Then head for the water rides before noon. Duelling Dragons often has smaller lines toward the end of the day. Use the single rider line for Dr. Doom Freefall if the wait is too long.