Dante's Inferno was the one I enjoyed the most, but DmC was the best overall (terrific voice acting, great controls, funny moments, amazing soundtrack).
Heavenly Sword was also great, just not as great (a bit short, but had my all time favourite voice acting).. God of War is all sorts of impressive but I really, really don't like Kratos and thus find myself not enjoying the game as much as I could because of him.