I like the juxtaposition of these two images, because you can clearly see the contrast between the illustrative work of cover artist Fred Guardineer (who was, by the way, the creator of Zatara the magician) and the stiff but blunt penwork of Joe Shuster. If you enlarge the image by clicking on it, you'll see more interesting details, like the tiny panel numbers, indicating the comic strip origin of Superman. The first Superman story was a cut-up and rearranged comic strip that failed to find a syndicate, and Joe Shuster continued to number the individual panels even after Superman found a home in comic book form.
You'll also see the brutal thugishness of the Golden Age Superman as he literally throws some character named Gimpy out of town.
But the most striking detail is the complete absence of Superman's name from the cover of the issue. No image of the character, no "Thrilling Superman Tale Inside!" cover blurb, nothing to indicate that the "Action" indicated by the title is anything other than some James Fenimore Cooper frontier combat. Weird, huh? We always think of Superman being popular from his very first appearance, but DC didn't necessarily know what it had during those first couple of years.
Plus, it makes me think about all the frontier action we're missing in comics these days. Sure, we have Roy Thomas's adaptation of The Last of the Mohicans at Marvel, but once the current Viking fad plays out, can't you see the rise of the Leatherstocking genre? It's been a long wait for those of us who fondly remember Action Comics #8.