I am a manager of one of Chinese mattress companies and had some experience with American mattresses as well.
Our company ordered Casper, Leesa, Eve, Purple, Tempurpedic and some other mattresses from US and UK and analyzed it's contain to make some kind of relabeled replicas for Asian market.
Briefly, we found that Purple and Eve were the most interesting ones in terms of their contain - for instance, elastic foam layer in Purple and Leesa's Avena foam. They are pretty the same memory foam despite the fact that they have cooling features.
And people who tested those 2 liked them the most in terms of temperature and support. I don't know much about Zinus and Tuft Needle ones but from description I see here -
they say that Tuft Needle is the best according to the review.
Zinus seems to be pretty standard memory foam mattress, yes, it is cheap but if money doesn't matter for you, then it is not a good option because it's top layer is memory foam which is hot and other 3 layers don't have cooling properties too.
My main point is if you are looking for memory foam - always look what is inside besides it. There always should be cooling layer
I don't know whether it helps you, I hope so.