For the last few years that I have been work as a DBA here, I have always used imp and exp to import and export data to the databases.
But with our recent increased used of 10g databases I have started to use impdp and expdp.
I felt that it would be better to use these versions rather that the outdated(?) versions. But the new syntax takes a little getting used to. But then again it took me a little while to be able to type and imp/dmp command without have to look it up or use an excel cheat sheet.
EDIT : Of course the impdp/expdp are also more powerfull, allowing for schema and tablespace remapping during the import.