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fkwM101-4/5 as a group are overall a bit more common that E120, and hold up better over time.
The 2 sets are tough to compare......
E120 was found in Caramel packs by kids, often played with and destroyed by them too.
M101-4/5 group (Printed by the Chicago printers Felix Mendelsohn) was sometimes available as a complete set of 200, and overall has 20 different back brands (many are very tough, none are candy, most are department stores or bakeries).
The E120 is more easily compared to other B&W candy sets of the era (ie E135, E121-80, E121-120, E122, E220, V61-1, V61-2, etc.).