I run scientific conferences and over the past 15 years have amassed tens of thousands of abstracts, videos, and digital posters from presentations. Over the last couple of years we've started creating specific sites to hold that year's conference data for pre-meeting marketing purposes, e.g.
But now my clients are asking that their entire archives be made public on the web. The actual work involved in doing this is trivial but I can't decide what is the best way to structure it. Should I have one large site (conference.org) and load all of the content into it using the year as a top-level category or should I continue to work backwards by year (conferenceYEAR.org)? What is the best from a user-experience standpoint? From an SEO standpoint?