If the options are Stalin or capitalism, then capitalism would be a clear winner even if it's shit because Stalin and his ideology still has the 2 issues from the first panel but on top of that he would execute anyone with an actual good system.
Well, there are like a million options beside capitalism so if it references Stalin I'm assuming it's implying the alternative is the weird authoritarian ideology Stalin made that tankies want.
Another interpretation I can think of would be socialism but Stalin isn't linked with socialism much here in eastern europe. Could be this works better in the US since they have some weirdness with conflating Stalin, communism, authoritarianism and socialism but I don't have those cultural impacts so I don't get it.
Best memes are the ones that require an explanation.