None of the provided responses accurately capture the key differences between Soviet propaganda posters and those used by other members of the Allied and Axis powers. However, if I had to choose the closest option based on historical context, it would likely be:
Soviet posters were less sophisticated due to the scarcity of experienced artists.
While Soviet posters were often bold and impactful, they were sometimes criticized for their roughness compared to the more polished propaganda of other nations. However, it's important to note that Soviet posters were also highly effective in their messaging and often featured strong visual elements along with political themes, contrasting with other propaganda styles that may have focused more on aesthetics.
Again, it's worth emphasizing that this choice is an interpretation, and the accuracy could vary based on specific examples and time periods.