Drop database vs. dbca delete database

Question

So I'd like to delete this database: control files, datafiles, log files, spfiles, everything. leave no trace.
I can use good old sqlplus and run "drop database;", or I can use DBCA and do "delete database".
What is the difference?
Documentation clearly explains what "drop database" will do, but it does not explain what DBCA is doing (maybe just running drop database behind the curtains?).

Answer 1

from the book of «OCP - Oracle Database 10g Administration I», Chap 3. -- Using the DBCA to Delete a Database p 3 - 14
«Dropping a database involves removing its data files, redo log files, control files, and
initialization parameter files. The DROP DATABASE statement deletes all control files and all
other database files listed in the control file. To use the DROP DATABASE statement
successfully, all the following conditions must apply:
• The database must be mounted and closed.
• The database must be mounted exclusively—not in shared mode.
• The database must be mounted as RESTRICTED.
An example of this statement is:
DROP DATABASE;
The DROP DATABASE statement has no effect on archived log files nor does it have any effect
on copies or backups of the database. It is best to use Recovery Manager (RMAN) to delete such
files. If the database is on raw disks, then the actual raw disk special files are not deleted.»
there is no distinction between the DBCA Delete a database and the drop database statement.