Sesame was designed for you to read its mind when it comes to understanding. Numerous questions about which one should I pick exists on the web. Just remember that if the post dates back 3 years, things may have improved (technology and software).
There are some basic rules here:
Moving away from custom triple stores - you can make use of database technology. Sesame works with postgresQL very well, and the other DB's are in the 'implemented but not supported' category. Numerous questions about oracle support are present on the mailing list, but many of them are not super useful or answered with anything really concrete.
More useful links for technology backends:
- 29 Aug 2012