The 19th March: Advantages: It's holiday. We can see the sculptures already built. The giving to la Virgen de los Desamparados will be finished and it's very beautiful with flowers. We can see La Cremá, all the sculptures burning at night. Disadvantages: There's no Night of Fire. No firework. There's no party after La Cremá (until 2:00).
The 18th March: Advantages: We can see the sculptures already built. From 15:30 starts the giving to la Virgen de los Desamparados. At 01:30 La nit del foc (The night of Fire) the biggest firework displays of the week. Party atmosphere. Disadvantages: There's no so much time to party after Night of Fire.