What are the key differences between Shimano derailleurs in terms of performance and features in a direct comparison?

Shimano derailleurs vary in performance and features based on their model and intended use. Higher-end models typically offer smoother shifting, lighter weight, and more precise adjustments compared to lower-end models. Additionally, premium derailleurs may have advanced technologies such as Shadow RD for better chain retention and reduced noise. Overall, the key differences lie in the materials, construction, and technologies used in each derailleur, which ultimately affect their performance on the bike.