Watch the video above which compares the brands in 4 different tests. The differences in performance are so small, I'd call them negligible. If they all perform the same, I'm from the school of thought that would ask, "Why pay more?".
Agreed. I had some Amazon points so I ordered the RTIC 30 oz for less than $10 shipped. I am sure I will pick up the Ozark if I find myself in a Walmart. I drink out a Nalgene with a soft cover all day. I go through 5 pounds of ice each day so I am glad I caught this thread.