Neither of them have a separate graphics card, the Nvidia 6150 is an integrated card, it just means the motherboards chipset is nvidea rather than intel.
I'd go for the HP, mainly as they are a better make all round than packard bell (a budget brand) and also because it lists 2 PCIe slots in it, so you could add a better graphics card in future if you wanted.
That said, the i3 is the better processor,but for most peoples use you would not be able to tell the difference.
What are you planning on using this computer for?