There?s no real method to be able to judge influence, because realistically you can be influenced by dozens of artists, but may only name drop a few. And what exactly is the influence based on? Is it songs? musicianship? lyrics? live show? All of the above?
For instance, a band like Kiss may not be highly influential with their songs, but their live show influenced countless acts that came after. Dylan and Springsteen would rank higher than most others for lyrics.
I think the one thing everyone could agree with is that the Beatles are the most influential act.