DATA Transfer from a remote machine :: which one is best SCP or VSFTPD

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Dear List
I need to collect bulk data files from some remote machines into my local
machine. I will be using a perl script to read about the  remote machines
directory listing from where I will get the  source data files.The remote
machines' directory listing from where I will get the data files most
probably changes time by time . So now please tell me which one is good
options can be used in this situation SCP or VSFTPD? I need a secure and
fast data transfer.

Thanks & Regards in Advance
Anirban Adhikary.

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