Which dog food?

Trying to find a new dog food for my finicky baby. I think she's a chocolate lab and terrier mix, she's 30 lbs, and is pretty active. She has gotten dandruff over the winter which has improved since getting her on Purina One Smart Blend Grain Free, but her coat isn't shiney or soft anymore and she's shedding A LOT. Like she lays down and leaves a large glob of fur behind. I've heard good things about these brands but I just can't decide. Any help would be nice.

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