DPR8EA-9 or DPR9EA-9?

in my FSM i saw that were a couple of spark plugs i could be using for my XRL, a standard plug (DPR8EA-9 NGK) and one for extended high speed use (DPR9EA-9 NGK), so i went out and bought the DPR9EA-9 and put it in my bike. i didn't feel any difference, so what would the benefit be from running either plug. the guy at the parts counter said the plug for extended high speed use was a "colder" plug, what does this mean?

what spark plugs are you guys running in your XRLs and why?

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