Any Point To Paper Submission Of Forms Versus Electronic Submission

I know we're not going to like this question because it has some obvious answers, but I am looking for a thorough breakdown, and I could not find another mention of this topic on this site. Paper Security is still Information Security. If this is a duplicate question, please point to the original and this one will be deleted:

For some pet peve, I still submit certain sensitive documents in paper through the mail. Obviously, this puts the information at risk of physical theft during transit and only circumevents the https portion of the journey. However, almost all systems that offer an electronic submission process will enevitably be scanned and input to the system. And then we must trust them to shred the original. Also, an electronic submission may go immeditelly to its final destination or it may need to traverse some sort of 'handling process', viewable by many, which may not be traversed by paper copies. Lastly, electronic submission could be vulnerable to local client-side attacks... sure we scan and practice safe habits, but can we ever be sure our systems are always completely clean?

I would like a definite answer: is there any security gained (or lost) by submitting a hardcopy instead of an electronic copy?