noun
BAD : There are several good arguments for people preferring to live in the countryside.
GOOD : There are several good reasons for people preferring to live in the countryside.
BAD : They don't want children, for purely personal arguments.
GOOD : They don't want children, for purely personal reasons.
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argument = a reason that you give to support your opinion, especially when you are trying to persuade someone: 'The writer's main argument is that a better train service will take cars off the road and lead to a healthier environment.' 'The argument against higher taxation is very simple.'
reason = something that explains someone's actions or feelings, or why a particular situation exists: 'My main reason for doing the course is to improve my qualifications.' 'He's got to go back to Mexico, for family reasons.'