Hi Bard,
The biggest difference between the Ultimate Dreams Natural and the Ultimate Dreams Eurotop would be that the Natural uses Dunlop in the 3" comfort layer while the Eurotop uses Talalay. The choice between them would be a preference choice since both are very high quality materials. There is more about the difference between them in post #7 here.
The Eurotop has an exchangeable comfort layer that allows you to choose the firmness of the latex when you make your initial purchase and also gives you the options to exchange the latex layer for a softer or firmer version of Talalay after a purchase if your sleeping experience indicates that you need it. The Natural gives you the option to choose the firmness of the Dunlop latex before your purchase but doesn’t give you the option to exchange it afterwards.
The Natural uses a combination of wool and polyfoam in the quilting material while the Eurotop only uses polyfoam and wool can help with temperature regulation.
The Natural has a 2.0 lb polyfoam support core while the Eurotop uses a 1.5 lb polyfoam support core. In most cases the support core isn’t the weak link of a mattress in terms of durability but for those that are in higher weight ranges (low 200’s or so and higher) and are more likely to compress the support core of the mattress “through” the comfort layers more deeply then the higher density can make some difference in terms of durability. For lower weights the density difference between them would have a smaller effect.
Neither one of these would be anything like the Rhapsody Breeze because they both have latex comfort layers while the Rhapsody uses memory foam in the comfort layers. There is more about the differences between latex and memory foam in post #2 here.
The biggest differences between the Natural and the Eurotop for most people would be whether they prefer Talalay or Dunlop and the importance of being able to exchange the latex for a firmer or softer version after a purchase.
Assuming that you have tested some Dunlop and Talalay latex so that you know which one you tend to prefer (or are comfortable with using a more general description to choose between them) and also that you know you prefer the more resilient and faster response “feel” of latex to memory foam … I would be cautious about basing your choice on anyone else’s experience because each person can have a very different opinion or experience on the same mattress and a mattress that is a perfect “match” for one person or even a group of people in terms of PPP (Posture and alignment, Pressure relief, and Personal preferences) may be unsuitable for someone else to sleep on. In general … the best source of guidance when you can’t test a mattress in person would be a more detailed conversation with the manufacturer who can help “talk you through” the options they have available that would have the best chance of success based on the details of your conversation and the “averages” of their customers that are similar to you (see mattress firmness/comfort levels in post #2 here).
Phoenix