The reasons there are so many variations in lubes used, besides the fact that each man has his own ideas on what works for him and what doesn't, is because we all live and shoot in different conditions. I general just use spit to lube patches when I am at the range in fair weather. The patch is not going to sit on the powder vary long before shooting, so it won't foul any portion of the load, and string my hits on the targets. But, when hunting, I change to wonderlube, now, and in the winter, below freezing( 32 degrees) I use alcohol for wiping between shots. I do use wonderlube on my patches because it seems to only get a little stiffer in the cold, but I like to dry out the condensed moisture in the barrel between shots in the winter before putting the next load of powder down the barrel. The patch with some rubbing alcohol on it does that for me, leaving me a dry, if not clean barrel for my next shot.
I have friends in my BP gun club who absolutely refuse to shoot when it gets below freezing, and become couch potatoes as soon as the temperature drops. They don't think its a fit thing to do to shoot your guns, much less hunt, when its that cold outside ! Obvously, they don't use any alcohol to dry their barrels in winter, as they never shoot, then! They also don't make a good person to ask for advice for cold weather lubes, etc.When it gets down to sub zero temperatures, you want to dispense with any oil or oil based lube at all, and just use alcohol for dampening the patch, and for cleaning the gun. Even alcohol won't work when it gets down to -60 degrees or so. I just saw where a hunter killed a muskox in Alaska when it was -65 degrees out. NOW, that is COLD !
My brother lives and shoots in Florida, where its humid almost every day of the year. He has had to learn to adjust his loading technique by drying his barrel between shots. If he doesn'tdo this, after several shots, his flash channel and nipple get clogged with gunk, and he has had to break the gun down to clean it to get it shooting again! By cleaning and drying between shots, he can shoot on the worst of days.
I have a cousin who lives in the mountains, where the relative humidity is low, even when its raining, he says! Only when its raining does he have to think about drying his barrel between shots. The rest of the time, the air is so dry he doesn't have to worry about a hot barrel condensing moisture from the air, regardless of temperature.
So, make a list of all these suggestions, and others, and try them. But, in the end, you probably will get better advice from an experienced ML shooter living in your own area as to which is the best lube to use and why. Pay attention to temperature and relative humidity, as IMHO and experience, these two things are the key factors in judging what kind of lube will work in your ML guns.