Hi tbizzle,
You may have read this already but post #2 here and the topics it links to also has much more information about mattresses and children and “safe” materials including a link to some general guidelines for children in post #2 here. It also includes a number of links to the better forum posts and topics about mattress and children as well which also include more information about many good options for children which may also be worth considering in a wide range of prices.
For younger children any mattress that uses materials that are “durable enough” (see post #4 here) that you would also consider to be “safe enough” and is in a medium firmness range or firmer would generally be a suitable choice for a child regardless of the combination of materials and components in the mattress. The choice between them would really be more of a budget and preference choice than a “better/worse” choice.
Phoenix