The Education Trust’s College Results Online website is based on the Integrated Postsecondary Education System (IPEDS) which is the same data used by the College Navigator reviewed last week. Obviously the differences between the two sites will be presentation, access, and selection of the data available.
(You can see an updated review of Big Future here.) 
Big Future is the college search website by the College Board. Since the College Board is the source of all things SAT, you would expect it have a pretty good college search function. It is also a member of the Common Data Set consortium which means it has access to data that isn’t readily available to other websites.
If you were to visit the major college search websites, you would conclude that people have just a few considerations when choosing a college. Based on the search options common to eight of the most popular websites, students want to be able to pick a college based on its location, the location’s setting, size, tuition, selectivity, test scores, majors, whether it’s a community college or four-year institution, and if it’s public or private.