Sturdy safe hands down. My buddy's liberty is a joke, it's like a tin can compared.
Someone said for one brand.... .."There isn't even enough room between the door and the body to fit a crow bar" Same with the sturdy, but grind a spot for a huge breaker bar and see what's what.
https://www.youtube.com/watch?v=4oOqDHedivQ&feature=youtube_gdata_player
Looks like that safe had maybe an 1/8" plate that they ground through. Some of the Graffunder models have 1.5" solid plate doors (before the insulation and the inner steel liner). You're going to have to so a lot of grinding to get a breaker bar started. But for the sake of argument, lets say the BGs actually
1. get the breaker bar started
2. pull a 5400 lb (empty), bolted down safe from against the wall or from a corner,
3. orient it on its back
4. and apply enough weight on the breaker bar to overcome the
a. ~1700 lb dead weight of the door
b. thats locked in place by ten 1.25" stainless steel locking bolts.