If you read the question from the OP, he was " seeking a safari style shirt and wanted to know who makes the best". It was just my opinion. Sorry if you disagree with me, I didn't notice a recommendation from you...
Different adventure wear companies sell a range of Chinese manufactured clothing and it is possible that different American adventure wear companies might even sell clothing made by the same Chinese manufacturer. (Note I'm using Chinese as a generic, a manufacturer could be in another country such as Indonesia, or Vietnam). The name brand American adventure wear companies all sell well made, high quality clothing, the real difference is in the fabric or fabric blend. I didn't make a recommendation because the person who asked the question did not provide enough information. He said a humid environment. I have no idea if he was referring to a Pacific Northwest rain forest or a trip through the everglades. Both would require very different fabrics. And different fabrics are affected by the thickness and tightness of the weave. Cotton is an excellent fiber for hot and humid if you don't mind the wet tee shirt look when you are being active in very humid environments. Cotton doesn't hold its shape well when wet so a cotton blend would likely be a better choice. On the other hand cotton can easily kill you in a cold humid environment.
Bamboo does a good job a wicking moisture and is often blended with other fibers for warm weather high activity clothing. Hemp clothing works well for both warm and moderate climates. It breaths well, wicking moisture off the skin and can hold about 20% of its weight in water without feeling wet. And polyester can have a wide range of properties depending upon how the plastic is extruded and how it is woven or knitted. If the plastic is extruded through dies that create tiny longitudinal grooves, the grooves can wick moisture off the skin through capillary action.
Bottom line is that I feel that all the name brand adventure wear companies sell high quality products for different environments and types of activities. I would first look at the shirts advertised for a given climate and activity level then choose among them based upon the fabric blend used and what each material in the blend contributes to the properties of the blend.
My personal favorite fabric for warm to moderate weather and as an inner layer is hemp or a hemp blend. Hemp, blended with cotton in a light weight loose weave would be a very good fabric for use in hot humid weather.