A candidate with one good BA is usually more attractive. Two average BA's looks a bit odd and raises extra questions.
For example, two BA's might show a breadth of inability, a lack of ability to think at a more advanced level (why did the candidate not use their extra time at university to progress to an MA or PhD), or poor decision-making (why did the candidate not switch degrees earlier if they chose the wrong subject).
It of course depends on what the candidate with one good BA has done with their time that they didn't spend on the second degree. It's always possible to throw away a good academic record with a bad work record (sit on the dole, go to jail, teach).