I think I would go for the 5130P. Why? Because it's platinum and 50 pcs limited edition, whereas the 5575G is white gold and 1300 pcs limited edition. Moreover, I think I like the guilloché more than the moon phase. And the 5575 has a closed case back, which is a pity because the 240 caliber is worth seing. And one last detail, I think I like the star-shaped hour hand of the 5575 a little less than the ring-shaped one of the 5130. BUT, all this is purely theoretical, not taking into account how they would wear on my wrist and what I would feel in real life: the concave lugs of the 5575, in particular, might win me over in the metal. So, follow your own taste and feelings!