adjective
1
BAD : Going swimming is more preferable to playing football.
GOOD : Going swimming is preferable to playing football.
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Do not use more with an adjective which contains the sense 'more' as part of its meaning. Preferable means 'better or more suitable': 'As far as I'm concerned, anything would be preferable to spending another night here.'
2
BAD : For most teenagers, living in the countryside is preferable than living in a city.
GOOD : For most teenagers, living in the countryside is preferable to living in a city.
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One thing is preferable to another thing (NOT than ): 'An old computer is preferable to no computer at all.'