Professionally, ERDAS has a more perfect data processing system, providing more processing functions for users to choose from, and can deal with almost all image processing problems. The domestic Titan is said to belong to the domestic series, but in the core technology, it has always relied on the progress of scientific research. At present, many algorithms have adopted foreign ideas. Therefore, although Titan is made in China, its technical means are still lacking in innovation. Therefore, generalized image processing can still be completed.
To sum up, both of them can complete the basic image processing work, and ERDAS is the first choice for the more complex and scalable ones.
Because I have studied the difference between ERDAS and Titan in image correction before, I just talk about my personal opinion for reference only.