HDMI or HD/AV component cables for gaming?

Which is best I have a 42" LG HD TV (1080p), and a tv that only supports 720p with no hdmi ports that's why I had to buy HD AV cables but I was wondering if hdmi cables were better for gaming if so I was going to buy a new tv (20-24") that supports 1080p and I was also gong to buy the hdmi cables if... show more Which is best I have a 42" LG HD TV (1080p), and a tv that only supports 720p with no hdmi ports that's why I had to buy HD AV cables but I was wondering if hdmi cables were better for gaming if so I was going to buy a new tv (20-24") that supports 1080p and I was also gong to buy the hdmi cables if they show a noticeable difference.... Thanks in advance.
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