Blauk, Staga,
I don't think there is a conflict between the two. There is, rather, a choice, just as there is between the Lancaster's bombload and B-17G's defensive firepower.
The Ju52 has a single light machine gun, 7.92mm, defending it but only has a top speed of 178mph.
The C-47A has no guns but reaches a speed of 229mph.
I know which one I'd take, and I suspect most people, and that would be the faster one. A single light machine gun simply doesn't change the odds enough.
I think the Ju52 would make a great armed alternative to the C-47A.