Asking merit

A: Can you tell me how this compares to that?
    B: This one is much handier to carry.
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    A: Which is the better material?
    B: I'd say either is good.
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    A: Why do you recommend this?
    B: This is effective against a cold.
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    A: What can this do that that can't?
    B: This is portable but that isn't.
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    A: What special features does this have?
    B: this works without a battery, but that one needs one.
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    A: Will I save money if I buy a dozen?
    B: You can save about ten percent.
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    A: What's the strong point?
    B: One of the best things about it is that it is easy to operate.