Hmm. The ENT and DS9 ships were being crushed by the pressure of immersion in a fluid. The TOS ship was in the grip of a pseudo-physical hand; the mechanical pressure created by that thing was uneven and thus no doubt far more dangerous to the structure of the ship, as it would create twisting and bending rather than evenly crushing forces.
OTOH, the ENT ship was damaged to start with, but then again, so was the DS9 one. Difficult to say which would best represent the "starship norm", but it does seem logical to assume that the Defiant
was the closest to being undamaged and in water-analogous circumstances. While she's explicitly more heavily adorned with physical armor than the average starship, the order of magnitude would still hover around the realistic (indeed, found in the real world of combat submarines!) megapascals. And that's before SIFs, supposedly, as those have been shown to work real wonders against bending or crushing stress in collisions.
But yeah, lots of room for speculation.