Hi dvto2,
The soy foam is likely memory foam (or could be poly foam too I suppose), except they’ve removed a smallish percentage of the regular chemicals that are used to make memory foam and instead use soy (or other plant based). You’d still want to know the density of it. As to better comfort, I’ve not heard that soy based foam is specifically better… Although they may have molded it different with pinholes or a different shape to allow ventilation.
There’s a good link on this forum about soy based foams by Phoenix, Which I can’t see right now. Anyhow, if you search it might pop up for you.
Edit: link is here
https://forum.mattressunderground.com/t/thoughts-on-eco-foam-beds