Why not get an STP cable?

i asked a question on here about cat 6 cabling and people were telling me to stay away from getting any Shielded Twisted Pair cables. From what i can see, they would be better and faster because of the less amount of interference and that's shown on websites selling those cables like newegg and tigerdirect. So... show more i asked a question on here about cat 6 cabling and people were telling me to stay away from getting any Shielded Twisted Pair cables. From what i can see, they would be better and faster because of the less amount of interference and that's shown on websites selling those cables like newegg and tigerdirect. So why would i want to stay away from these cables? just dont want to make a mistake in buying a cable i shouldnt
thanks
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