PCI USB controller cards. Same but different(cheap electronics)?
The second is keyed as a 5V only pci card, and the first (with the caps) is keyed as a universal (3.3 and 5v) pci card, I suspect the extra components, and the electrolytic caps in particular, are for power filtering/regulation/conversion so the card can be used in both 3.3v and 5v pci slots. 

I would suspect both work equally well, usb is a pretty standard component for ODM's to make and its not hard to make it work, I wouldn't expect it to have any kind of performance impact on a defined communications standard like usb.