Champions with One shot potential > Other Champs?

So this is just a broad question on league of legends, Are Champions that have One shot potentials better than those who don't? For example : Take a champion like {{champion:131}} Diana, who can easily one shot someone Mid-Late game. Then, take another champion like {{champion:61}} Orianna, who does damage, but can't one shot like Diana does. In this sense, is it right to say Diana is a stronger champ than Orianna? is it right to say she brings more to her team, or is there more to it? If the answer is Yes, (Diana is technically a stronger champion than Orianna), does that mean a team a team that picks 5 champions that can one-shot will be more superior to a team that picks champions like Orianna, Elise, Morgana, etc. Please Elaborate :)
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