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Advantages and Disadvantages of HTTP
HTTP uploads provide an incredibly simple method of uploading files to a server, with minimal knowledge about file transfers. Downloading a file is also incredibly easy too. However, the disadvantages lie in HTTP's lack of power when it comes to file uploading. Also, a programmer needs to have the knowledge required to create the form in HTML, in order to upload the file in question. This especially is true if the file is for a social network similar to Myspace or Facebook that they're creating.
Advantages and Disadvantages of FTP
Using a FTP server offers advantages of its own. For one, a user can use a program to perform a mass upload to a server, not having to worry about repeatedly having to rebrowse for files and re-upload them using one form. Downloads can also be done en masse as well. Unfortunately, an FTP server still requires an FTP client to use, and the use of one would be particularly cumbersome to those who just wanted to upload a picture or two.
Differences
Ultimately, FTP and HTTP file transfers have completely different purposes. FTP's file transfer purpose is more or less for website maintenance and batch uploads, while HTTP is for client-end work and for end users to upload things such as movies, pictures and other files to the server. Often times, a programmer will use FTP to upload the files that allow an end-user to upload files via HTML/HTTP as well.
Leia mais: HTTP vs. Transferência de arquivos por FTP | eHow.com link