When do you usually play your main Chamption ?

In my rank games , I usually meet a variety of players those with lvl 7 mastery and those with low pts champs , I know that masteries doesn't mean anything in particular but I do believe you can carry with a champ you're familiar with more than a new or little knowledge about . Yet I still see players who prefer to go champs that they're barely familiar with because of a Korean player who Obviously picked one of his main champions and managed to win with it in a non meta lane , or they just pick other lanes to " try " a particular champ that got released recently . IMO I do think if you want to climb then using a main champ would definitely help without relying 100% on your team to carry you What do you guys think ?
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