Mercury or Lumines?

[operative x]

I am (hopfully) going to be able to get a psp tomorrow and i am stuck between Lumines and Mercury, which one is a better puzzle game? I hear nothing but good things from Lumines, and i dont hear anything bad about Mercury, its just the people who play Lumines seem to be addicted to it while the Mercury people think its just a good game. So which one is a better deal Lumines or Mercury?