Best lube? If you can pull your sideplate, a good synthetic grease on the pivot pins and double action interface will provide the best lube and won't run out or oxidize over time. This isn't my idea, a number of pro gunsmiths and manufacturers of high quality parts will tell you the same thing.
I can't count the number of dweebs with oil stains on their uniform I have seen over the years. Oil runs out and oxidizes over a short time, good grease stays put-for years.
The same with autos, put oil on the rails and it runs right out when holstered. Do as you wish, but real long term lubrication means grease, over a few short term shots it doesn't matter if you go dry or not.