These are entirely different kinds of attractions. I love Dueling Dragons, feel like I'm flying a dragon on Ice especially, so take my view with that in mind.
There are no inversions on Mission Space. I do feel pressure on my chest and face during "lift-off" and at one point later in the ride. I have not felt bad after any of the 4 times I've ridden it. And I'm someone who can no longer do tea-cups or tilt-a-whirls.
Follow the instructions to face forward, and I think you'll be fine.
HTH