I would think E91. The first 1908 series was among the first widely distributed sets since the 1880’s, so it probably was the first baseball cards a lot of kids had. Series 2 and 3 using the same images and going generic surely hurt. Today they are generally disliked.
T201 is in a similar boat. I like them, but many of the images barely resemble the player they are supposed to depict. The innovative design must have seemed really cool and different to kids in 1911.
For postwar, I would think Topps checklists. They sell for good money now due to scarcity in unmarked conditions, but I think few actually like them, they just sell to set collectors. At the time, with no Beckett or online checklists, I would have been thrilled to get one so I knew how many cards there were and who was in the current series. The amount of marked checklists out there indicates many kids of the time sure made use of them
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