Since no one has answered I'll go along with them and say "to be honest, I just don't know if one is better than another." We used to pickle our seasonal engines with Marvel Mystery Oil, but I am not sure that applies. With the exception of the Chrysler Industrial Hemis which ran on LP and stayed pristine, the engines tended to run a tad rich and in fairly dirty environs (agricultural use) and the MM oil loosened carbon and sludge which was drained/flushed before the engines were put into use the following season.
What ever you use, filling it up as much as you can will help by reducing the amount of air that will expand and then contract with heating and cooling. Over long periods of time the issue is with the cooling/contracting air that brings in water vapor with it that can condense and collect. So, keep it in as constant a temperature as you can; spin it over, in gear, periodically and maybe every other time drain just a little oil to check it for moisture (water or milky oil.) Make sure drain is at lowest point and give it time to settle if you have moved it.
Regards,
Lynn