The SWW thread is recommending the 2nd Fantasmic to ensure a good view of the SWW fireworks followed by quickly going to Fant. The concern is that after the first Fantasmic, it will be difficult to find a spot with a good view of the Hat and fireworks.
Fp+ has been offered for the 2nd Fantasmic. It guarantees you a seat in the Fp+ area. The area consists of all the seating sections to the left of the reserved Dining Area. In February, standby guests filled in the Dining Area for the second show while Fp+ stayed to the left of the rope and CM/Manager barricade.