There is no "Best" lens for any condition. Especially in low light / flat days you have to remember - ALL tinting reduces the amount of available light. Tints have been scientifically tested, informally tested, hyped up and hyped down for decades. The only truth out there is what you "like". Most snowsport enthusiasts will tell you they prefer the amber or rose color in flat lighting. Personally, I can't stand them in any light - they distort the color so bad (IMO) I don't know how anybody uses them. My personal favorite is the blue. It seems to take the edge off the bright light days and doesn't negatively effect the flat lighting and the best part for me is that the color spectrum stays fairly true.