First of all, if we want to evaluate it as a whole, Li Bai's songs can be said to be classics, while Ye Lao's songs are relatively inferior. But Li Bai's poem is a typical representative of romanticism, while Ye Lao's poem is just a very ordinary poem. After all, the two cannot be compared.
In terms of imposing manner, the description of "flying over three thousands of feet and suspecting that the Milky Way will set for nine days" is obviously more magnificent than "Pearl Screen".
In terms of technique, Qianzu used exaggeration, suspecting that the Milky Way had some metaphorical meaning when it set for nine days. Together, these two sentences bring out the best in each other, giving people a nine-day galaxy-like momentum.
Lao She's description is more of a profile, focusing on grasping the sound, while the intuitive performance of the waterfall is relatively weak, just using some pale compliments. Its highlight is the part before seeing the waterfall. The description of the waterfall sound is very classic, and two metaphors are used to render the momentum of the waterfall, creating a huge atmosphere that people can't help but daydream.
If we say the same thing, I think it should be said from the artistic expression. In terms of art, good works need to give people aesthetic feeling. Literary works are art, not just words. For the description of a scene, such as a waterfall, we can say that it is so big, magnificent and magnificent, but no one can understand an article like this, because what you said is too pale for others to really understand. Therefore, literature is a method of expression, that is, to express your feelings in words.
These two poems are exactly the same, and they both use metaphor, exaggeration, profile description and other expressive techniques, so that readers can truly feel the majesty of the waterfall.