what 700 tire size is fastest?

i am an old man. back in my day, i rode on 700x20 tires at 125 psi because we believed narrow is faster. these days, you whipper snappers have figured out that narrow does not mean faster. so my question is..... assuming the same brand and model of tire, which 700 size is fastest? i am guessing 700x28? throw an old geezer a bone, will ya?