There are two many big differences to enumerate, but a couple more important ones:
Guantanamo: "As of August 2013, 164 detainees remain at Guantanamo"
North Korea: "When Shin worked in the garment factory and accidentally dropped a sewing machine, the foreman hacked off his right middle finger just above the first knuckle as punishment"
Starting 16 November 2009, as enabled by the Supreme Court ruling in Boumediene, dozens of detainees began to use habeas corpus petitions in U.S. courts to seek freedom from the Guantánamo Bay prison. In some cases, they testified by video from the U.S. naval base in Cuba. Fifteen Federal judges have found the government's evidence against 30 detainees wanting and ordered their release. That number was expected to rise as the judges were scheduled to hear challenges from dozens more prisoners.
How many North Korean prisoners get any kind of hearing?