Hi msalamanques,
This is always a preference choice rather than a “better/worse” choice and just like with any preference issue you are really the only one that can decide which one you are most likely to prefer. The most reliable way to find out which one you tend to prefer would be based on your own personal testing and experience.
This would really depend on all the other variables that affect temperature regulation besides just the wool or the type of latex (see post #2 here). I don’t think that most people would have temperature regulation issues with either one so it may be a moot point but these are generally the types of questions that have so many variables involved that they would be better answered based on actual experience rather than “theory” and they would be in the best position to be able to tell you whether one would have a clear advantage over the other in terms of temperature regulation based on their knowledge of their own mattresses and feedback from their customers.
The choice between different types and blends of latex is really a preference and budget choice more than a “better/worse” choice as well. There is more about the different types and blends of latex in post #6 here and there is also more about some of the differences between synthetic and natural rubber in post #2 here but your own experience is really the only way to know which type or blend of latex you tend to prefer or whether the more costly versions are “worth it” or “feel better” to you.
Again … this is strictly a preference choice and there is no way for me to know which one you may prefer.
Phoenix