Personal I prefer the pci vision against the USB type they are not hard to install
Once you read the manual before doing the install, most people these days only read the manual after, when the problems start.
As they have a feeling that they know it all and there mate say to do it so and so
The USB version is easily to install just plug it in and load the driver, but can be a pain in the rear at times and i find the signal strength can be low depending where the wireless router is place in the house
You have to decide which one is best for you and the location
The only problem I have found with PCI wireless cards is the fact that they have the aerial round the back of the machine close to the electrical interference of the PC itself. I have a desk top with one and is the weakest signal of all of my machines, I prefer USB with extention to get the adapter up high and away from the machine.