Why do AD assasins get all the love?

Why is it that AD assassins like {{champion:238}} get all the love while they have much less utility compared to some of the AP assassins such as {{champion:131}} Who ok i guess admittedly she's best with Mixed damage at times but her full potential (Q, RE, W,AAA, Q, R) is most efficient at full AP. Is i the lack of escapes or what is it? Because personally I'll take Diana over Zed any day, and i have deleted entire Zed colonies as diana.
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