This question is relevant only for candidates with previous content writing experience. If you have written on variety of topics then it will be definitely better than having written just one type of content as most companies want writers for all types of writing jobs and not just one or two. Still, hardcore technical writers will not be expected to have a wide writing range except for their own domain. For others it's advantageous to present yourself as generic content writer and not specialized unless the job demands so; for instance, travel writing job. Apart from the writing part also mention other associated responsibilities like, finding keywords, URL suggestion, title tags, page layout decisions, content selection, handling a team, editing etc.