Whatever drove the pference of one over the other back then is kind of lost. I spusect there was some reasoning back then (hold over from the 32-40's fan base?) but whatever it was, today's shjooters aren't infected.
Have read some writters (writting well after that time frame) think that it might be becasue the ownwers might want to use black powder, which worked better with the 1:16 twist of the .32 special...which seems like speculation to me...and the Remington developments wouldn't have had balck powder as a possible excuse.
So evidently, the .30 vs .32 was a "thing"back then. Remington came out with the .30 Remington and the .32 Remington....basically the same choice as between the 30-30 and 32 special in a rimless case for their new semi-auto rifle. MAkes me doubt the above black-powder .32special theory as I seriously doubt anyone wanted to run black pwoder in their Model 8 semi-auto.
Pick one....30-30 or .32 special....makes about as much difference in perfomance as what color socks you wear.