eCognition is better  for both image segmentation and object-based classification in comparison to ERDAS objective. It has many advantatges such as flexibility in ruleset generation, inclusion of vectors during image segmentation and hierarchical classification etc. A brief comparison is attached for your ready reference.

Based on some works, i've noticed that Ecognition has a higher efficiency in the definition of classification rules of the objects, which allows a higher reliability of the final results

eCognition is better  for both image segmentation and object-based classification in comparison to ERDAS objective. It has many advantatges such as flexibility in ruleset generation, inclusion of vectors during image segmentation and hierarchical classification etc. A brief comparison is attached for your ready reference.

Dear Tapas and Miguel,

Thanks very much for your answers! Now, I got a clearer image about their differences! Very useful information.