Sending DVD for festivals vs using online services

Hello every one,
I'm wondering right now:
1- To register online through the film festivals web site and send them a DVD by post.
OR
2- To use sites like withoutabox, reelport, ... etc?

And what do you think about uploading your film on such a sites servers and to submit your film using them services instead of sending it by post?
I don't know which is better? and which is safer?
Any advice no matter how small it is, I will love to read it.

Thanks, :)
 
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