To answer the original question:
I have used both, and like Huntindog says, they really do different things. The axels on my new TT are much further apart than my old one, so x-chocks and their ilk probably won't work for me now. I do have the strong arm bars on my stabilizer jacks, and they work very well.
That said, I don't try to remove all motion, only enough that I don't feel like I'm at sea again. If I wanted to eliminate all motion, I'd just stay at a hotel.
Here's a pic of the strong arms. I only used the 4x4 in my driveway because it was handy. I usually use the lego type blocks under them.
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