Hi kobec,
The closest equivalent to the Plushbeds Botanical Bliss 8" would be somewhere in between the SleepEz natural 9000 (which uses your choice of 100% natural Dunlop or blended Talalay in all three layers) and the Organic 9000 which uses your choice of organic Dunlop or 100% natural Talalay in all three layers. In either case with the 9000 you have your choice of 4 firmness levels in all three layers and any of them can be re-arranged or exchanged. Both are 6" + 2" designs.
In terms of the cost of the latex from a raw materials point of view … 100% natural Dunlop or blended Talalay are roughly equivalent and 100% natural Talalay or organic Dunlop are also roughly equivalent to each other and both are a little more costly. The Plushbeds uses a support core layer that would be one of the options in the natural 9000 (100% natural Dunlop) and a top 2" comfort layer that would be one of the options in the organic 9000 (100% natural Talalay). They would have a similar cover and the SleepEz has more options for adjusting comfort and support because there are three layers that can be re-arranged or exchanged not just two.
Both are certainly good quality mattresses.
Once you have eliminated the worst options and are down to choices between “good and good” I leave final choices up to the members (see post #2 here) but SleepEz has slightly better options for customizing (before and after a purchase) and a lower cost which may play a role and SleepEz is also a member here which means you are entitled to a further 5% discount off the cost of the mattress.
Hope that helps.
Phoenix