Lately, I've been using Hoppes or RemOil because I have it here.
In the past, I've used motor oil in an empty eye drops bottle, transmission fluid, CLP, 3 in 1, machine oil, air tool oil, some WWII vintage lube, white lithium grease, and just about anything else handy.
One time while we were out in the desert, a buddy brought a brand new AR he's just finished putting together. He'd neglected to lube it and it was choking. I had nothing in my range bag, so I pulled the dipstick out of the Jeep and took care of the problem.
By the way, that was the last time I had nothing in the range bag.
If I have a preference, it's either CLP or RemOil. Mostly because of the small size of the container.
I would like to try the Lucas stuff, but I can't find it locally. Lucas has a great reputation in the lube business, and I think it's worth a shot, so to speak.