I've read somewhere that the PAL/JPN versions of this game are faster then NTSC. I know one reason is that you can blow up the boulder with a rocket on PAL. What are the other differences?

On PAL, the enemies are less aggressive and spawn differently. Del Lago only requires 10 hit with the DA lowered in the proper way. It can also be done on NTSC but it would end up costing you time. Most have said it's the 'easier' version but they're two different gameplays so we have two different categories.