I don't know if there is a "best." I've maintained five 1100's for the local 4-H Shooting Sports for a couple of years now and tried several quality products. Didn't see a difference. For the last few years I've wiped the magazine tubes and so on with a paper towel dampened with a modified version of Ed's Red to clean gunk then wiped with a dry towel as part of cleaning after every session.
The trigger group, receiver, etc. gets thoroughly cleaned once a year with carburetor cleaner then a coat of Brownell's Rust Preventive #2 which is blasted around with an air hose. The excess that didn't get blown off gets wiped off. Then pivot points are lightly lubed with a quality synthetic oil using a needle dropper. I've tried several and, again, saw no difference. The trigger group (and bolt) doesn't get touched until next year's cleaning.
No stoppages for a couple of years. There are many ways to skin this cat, that's just one
One of the major problems that I see with the shotguns the kids bring is way too much oil. All it does is pick up carbon and dust to make a gritty sludge. Modern shotguns with modern steels just don't need much lubrication, and modern lubricants with their affinity for steel want to stay where you put them.
