Which literature is best researched using a database, which one is best researched using the catalogue?

Databases offer the possibility to look for information independently of the stack available at the University Library of Erlangen-Nürnberg (UB).
Depending on the database, you will find books, articles, and essays on different fields of study, when indicated also with access to the electronic full text.
If you look for books or journals available at the UB, it is best to use the catalogue.
If you look for literature concerning a certain topic independently of its availablity at a library, use a database.