Hi djag67,
I would need to see you lying on the mattress or have a longer and more detailed conversation on the phone about your experience on each design (which of course isn’t possible) to know which one would be most suitable for you.
I’m certainly happy to speak to the quality or value of a mattress, help you identify any weak links, or point to more knowledgeable and experienced manufacturers or retailers. In terms of design choices though … mattress firmness/comfort levels in post #2 here has links to some of the theory behind different constructions and the two ways I know to make the most suitable design choices (either personal testing or longer conversations with a knowledgeable manufacturer or retailer about a known mattress where they can use the “averages” of their customers to help you make a choice).
In terms of “risk” … I would tend to avoid or at least be very cautious with 6" of softer latex in the top layer unless at least part of it was zoned. While it could work well for some people … I would suggest either very careful testing on the specific design so you are confident that you are not risking alignment issues or as a backup make sure that you have the chance to make adjustments or change a layer after you have slept on it. In “theory” it seems somewhat thick/soft to me for a 6’ 190 lb back sleeper.
Phoenix