Hi flieder,
That would depend entirely on which one was the best “match” for you and for the parts of your personal value equation that are most important to you. Thickness is only one of many criteria that can affect which mattress is the best choice for any particular person although of course additional layers of more costly materials like latex also adds to the cost of a mattress compared to thinner mattresses that uses the same material or type of latex. For some people a thinner mattress would be better “value” because they wouldn’t notice enough difference with a thicker mattress and for others a thicker mattress would clearly be a better choice for their body type, sleeping positions, or because they preferred to have more options to rearrange layers to fine tune the comfort and support of their mattress. There is more about thicker mattresses in post #14 here.
Phoenix