Remote Client copy :-
This is one step process
RFC connection is required.
CC can be used with multiple parallel processes
Remote CC is better if you have small data to be copied.
Remote CC might be little bit slower than the export due to its network constraints.
Need to check Network, Database ( generation of archive logs, table space usage ) through out the CC.
This is 3 step process ( export- import-post processing).
RFC connection is not required between systems.
Multiple parallel processes can not be used.
Export-import is generally used for copying larger amount of data.
Export-import is relatively faster than the remote CC.
Need to check DB constraints at the import process.