which is faster: file transfer via LAN+wifi or wifi+wifi

I got one of these, a USB wifi N adapter

Source


So, I was thinking, what would be faster between my laptop and my desktop via my belkin wifi N router: the desktop connected via LAN and the laptop connected via wifi or vice versa


So i tried transferring some files from my desktop to my laptop. And here are the results

both connected via wifi = ~3 MB/s
laptop connected via wifi, desktop connected via LAN = ~8 MB/s
laptop connected via LAN, desktop connected via wifi = ~8.5 MB/s

this is unusual since wifi-N is supposed to be 150 mbps or 18.75 MB/s

the end