My personal opinion is a list should not be started and categorized with Krytox in the #1 position, when the OP is selling it in his sig. Even if some regard it as the best, with respect to Tekno_Cowboy, I have to question the objectivity. It also does not make sense to have Super Lube and Tri-Flow in different categories if they are stated to be similar.
I do not agree that as soon as you hear there is some petroleum based vehicle that it belongs in the "poor" category. That is your decision, but based on my use of Nano-Oil, I do not support it since I am not seeing any significant breakdown of my O-rings in about 2 years of use.
I have not used Krytox, but have used Nyogel 759G & 779.
I have well over a hundred lights, mostly Aluminum, but also a number in stainless & Ti. I started using Nyogel because SF uses it. However, I was always irritated by the messy black/gray grease that would get on my fingers and anywhere I rested the lubed parts. This happened no matter if I meticulously cleaned the threads, and reapplied Nyogel (mostly 759 on threads). There were some threads that had some degree of a grit or tight feeling, but I just dealt with it.
I switched to St. Claire's Nano-Oil when hearing about it from Milkyspit. I was astonished at how well a couple drops of an oil worked better than Nyogel on every thread I used it on. It gave considerable improvement especially when I used it on threads that were not well cut. The lights that had a slight scraping sensation were transformed--as if their threads were cut by a master craftsman.
My understanding on Krytox, and I believe similarly with Nyogel is that they do not provide the same level of metal on metal friction protection, where Nano-Oil excels. My observations of the black/gray wearing discoloration of Nyogel is happening because the metal on metal friction is causing breakdown. Black is from the O-rings, and gray from the aluminum. With Nano-Oil, I have not noticed any of the discoloration. In addition, so little is required for adequate lubrication, there is no mess when opening the lights.
I'm sure that Krytox and Nyogel are wonderful on highly polished (frictionless) surfaces such as pistons or O-Ring lubrication, but soft aluminum threads--especially tightened under a tailcap spring-tension are a totally different application. I think Krytox/Nyogel would be fine in a harder Ti type application where threads are well made and the metal is hard. I won't use those grease lubes on my Aluminum lights.
It is true that Nano-Oil has a petroleum based vehicle, so it is recommended to use BUNA if you are worried about your O-ring health. Personally, I can replace O-rings, but once your threads are galled or microscopically broken down, that is lost forever. Christian has told me that his goal with Nano-Lube was to protect metal on metal friction, not the O-rings. Despite that, in the almost 2 years I have been using Nano-Oil, I have not had to replace any O-Rings.
For those who have not seen it, St. Claire has posted the MSDS pdf here for his Nano-Oil.