I also use FreeOTFE.
The issues I have with other file encryptor is that you can see the filename, and what type of file it is. (much like winzip, and you can open the winzip and see what the file is). Also, most ppc encryptor only encrypt one file a a time, which makes decryption of a entire directory difficult (and slow).
I'm a bit anal about people seeing a filename that is encrypted, this tells them how bad they want to hack that file... (e.g. if a file name is password.doc, pretty good chance that file contains some interesting material, and hacker would focus on that file more).
Another thing is, the encryptor must use more than just numbers... that's another of my "thing" :)
That's my 2 cents