I wonder how suitcase-full-of-truecrypt-disks compares to pgp/tls transport of data over the internet in terms of probability of detection, interception and acc

I wonder how suitcase-full-of-truecrypt-disks compares to pgp/tls transport of data over the internet in terms of probability of detection, interception and access. I recall the US now has a relatively free hand in confiscating storage media for analysis/cloning during border crossings, and you might not get your copy back for a couple of months if they take a serious interest. So, even though the aeroplane travel infrastructure itself is quite reliable, there are points of failure that would require another copy of the data to be created and shipped, with a much greater latency (It might take days to purchase more disks, transfer all the data onto them, find a willing courier, book their flight, etc).