Who to be my first r5?

Just finished 8.3 exploration and got a science r5gem.havent done 8.4 yet so which champ will help me most there?I like Scorpion the most but I know torch is a beast, for people who have done 8.4 which is the more useful? 

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Do Scorpion. He’s helpful for 8.4 as well.
Jinx