Here’s what I know based upon my experience in a variety of scenarios:
1) Tiburon (previous version): They are comfortable and handle high heat very well. But the material picks easily and anything with a point goes right through them; this includes mosquitos. Same issue with the previous version of the Tiburon shirt. Both look like Velcro after a couple of days of somewhat gentle use in the desert Southwest.
2) Kutana: They are comfortable, material does not pick easily, handles heat very well; no issues running them in AZ heat past 110*. But it is not the best choice for sustained cold, not the stretchiest which may cause climbing issues for some folks; never had this issue myself. These are my favorite pants that Kuiu makes. Have one pair with over 70 days in the field with tons of hard use and abuse; just now starting to show a bit of wear.
3) Attacks: They are comfortable as hell, nice to climb in, and are well suited to sustained colder/cooler temperatures. The material picks easily and is not well suited for warm to hot temperatures. One day into a desert sheep hunt and they looked like Velcro; first day wearing them. Will not buy any more Attacks for hunting.
4) Pro: Almost as comfortable as the Attacks, nice to climb in, well suited to colder/cooler temperatures, and the material is significantly less likely to pick as the Attacks but not as well as the Kutanas. Some folks don’t like knee pads and these also are not the best option for warm to hot temperatures. Remove the knee pads and they are what the Attacks should have been. Wore mine for 16 days hunting Dall sheep and grizzly bear with no signs of wear.
5) Talus: Well suited for colder/cooler temperatures, easily to climb in, and handles light-ish moisture and strong wind very well. Seems to be fairly resistant to picking; no signs of wear from my hunt on Kodiak. Not well suited to warm or hot temperatures nor tons of rain.
No experience with the Axis pants.