Fields-Picklo Vs Drummond Catalog

Some background. I collect Cinderellas from philatelic clubs, organizations and events from 1930 to 1939. Starting in the 30's thru the 50's collecting was in its heyday.

Since starting, I've used the Fields-Picklo listing as my guide. Over time I've discovered that there are a number of issues that are not on their list. That started me thinking, is there a better catalog or listing that is more comprehensive? I've read that the Drummond catalog is a better guide, but its costs is a major drawback. Plus I haven't seen any collectors or sellers using it as a guide.

So I guess my question is, is there a better list/catalog than Fields-Picklo??