Hi chrstnamarie,
The mattresses you are considering are a combination of “all latex” mattresses and latex/polyfoam hybrid mattresses and they also use different types of latex and quilting materials and they have different firmness choices as well as different options to change the comfort level either by adding a topper, exchanging or rearranging the layers, or flipping the mattress. The choice between them would be based on your personal preferences and the parts of your personal value equation that are most important to you.
There are no weak links or lower quality materials in any of them and any of them could make a suitable choice. There are also some other lower budget latex and latex hybrid mattresses listed in posts #3 and #4 here that may also be worth considering. Post #2 here also includes links to the better forum posts and topics about children and mattresses that may also be helpful.
I would make your final choice based your preferences of materials, which one you believe would be most suitable for your children, your conversations with each manufacturer, the options you have to change the comfort level of the mattress when your children get older, their body matures and develops, and their needs and preferences change (by adding a topper, flipping the mattress, or changing the layering), your budget, and finally based on “best judgement” and which one you are “leaning towards” most strongly.
There are no “bad” choices in the group.
Phoenix