I think its obvious, but Just because a product "meets the spec" does not necessarily mean they are all created equal. In my past life working on and around the big birds the only thing I ever recall seeing/using was PRC.
And if I'm not mistaking, most of the "soft gooey sealant" issues that have cropped up over the years on builders tanks that were blamed on the blue dye, were determined to be sealed with flamemaster.
And yes, I choose products based on past performance, familiarity and history, ones that I know work. I do not choose products based on the lowest cost, I have found that you generally get what you pay for.