Should I use the wireless LAN or not?

My new desktop HP Pavilion Elite m9150f Media Center: http://www.engadget.com/2008/01/03/hp-pavilion-elite-m9150f-pc-handles-hd-dvd-ota-tv/ It has a built-in wireless LAN in. .. already.Will cable but would be better if I use the wireless option? which means faster, or other thing? I am a beginner (as you can guess) and I have no idea what it is …… Thanks for the best expert advice.

if possible by cable is the best option more reliable

ASUS O!Play Air – Wireless N TV HD Media Player

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