benefit (a good or useful result or effect): I do this for your benefit more than mine.
good (something that is useful to a person or situation): The social workers do a lot of good.
advantage (a thing that makes someone or something better or more useful): He had the advantage of being tall. The advantage of living in the country is the fresh air.
merit formal (the quality of being good or worthy): This project has no scientific merit.
strength (a quality or an ability that a thing or a person has that gives them an advantage): Her strength is her dedication.
virtue (a quality that is useful in an activity): This chair has the virtue of being adjustable.
asset (a person, thing, or quality that is valuable or useful to someone or something): He is an asset to this company.
plus informal (an advantage or a good point): A good knowledge of English is a plus in this job.