I just watch the matches that I watch - Lewis does lots of things well, and Williams does lots of things well.
They're different kinds of players, and personally I would prefer Williams as even in a losing Warrington team I can see enough from him that makes me feel like if he was playing in a team like Hull KR then his "stats" would be a lot better.
I do also think there should be some weighting to the HB partnership England have used for the last 2 series where they have come through with 0 defeats. If that is bias, then sure I am completely bias.
I don't even remember Wane making many comments this season about the HBs, its more just you coming to every Warrington thread and comparing them, picking out any mistakes or poor games Williams has, while seemingly ignoring the ones that Lewis has.