As far as i know,
As far as I know, American Agates are pretty much opaque marbles - maybe a little translucence, but I think it would be very unusual to see one with this much transparency. I think the color is off too - AAs are more red.
The light is coming from behind the marble so there is a shadow over the front and that makes it hard to see much detail. But from what I can see, I am leaning JABO over Vitro.
You're fairly new to this hobby, Melissa, once you've collected for 10 years and haven't seen another one you'll be even happier with your decision.
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