Wireless Type Question

Is there really a difference between using a PCI wireless card vs a PCI express card?
I'm going to need to use wireless over Christmas break and maybe next summer as well since my parents house isn't the newest (so it doesn't have ethernet connections in rooms and the cable only comes in downstairs from my room). I can't just run a ethernet cable up to my desktop or anything like that so my only option is to use wireless. In my old desktop at the house I used a pci wireless card and it ran great but now that its a couple years later and pci express is easily available. I have both types of slots open in my desktop.
For example what I'm glancing at:
pci express: http://www.newegg.com/Product/Product.aspx?Item=N82E16833166063
pci: http://www.newegg.com/Product/Product.aspx?Item=N82E16833340013
I'm going to need to use wireless over Christmas break and maybe next summer as well since my parents house isn't the newest (so it doesn't have ethernet connections in rooms and the cable only comes in downstairs from my room). I can't just run a ethernet cable up to my desktop or anything like that so my only option is to use wireless. In my old desktop at the house I used a pci wireless card and it ran great but now that its a couple years later and pci express is easily available. I have both types of slots open in my desktop.
For example what I'm glancing at:
pci express: http://www.newegg.com/Product/Product.aspx?Item=N82E16833166063
pci: http://www.newegg.com/Product/Product.aspx?Item=N82E16833340013