Benson slid a bit towards the end while Charles excelled. My only worry about Charles is he is small and might not be able to handle the full load for all 17 weeks. You might end up seeing another back in the mix next year stealing his carries.
You could make an argument to keep Benson over Wayne. Really depoends on whether you want a balanced team or you want to be strong at RB.
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I would probably keep Charles and Benson. The Bengals have already said that they want to be a run first team again next year and right now there is no one to take carries away from Benson. A lot of things can happen between now and week 1 but if I had to choose today I would keep Charles and Benson
In a PPR format Wayne scored more than Benson by almost ~60 points. I really don't think much will change going into next year. Wayne is more favorable than Benson in my eyes...in your format you only really need to start one RB. It would be great to keep both Charles and Benson but I would roll the dice and go with Charles.