Hi M,

Undoubtedly achiever batch is much better than leader batch in Allen. It is because of faculty only. They cover approx 99% of the syllabus. They are the bonafide faculty of India and some how it also depends on student because they are the ex-allen students. They have already studied there. In that batch , student only need a proper guidance. So the HOD provide the best faculty to the achiever batch. And the students in leader batch are non ex-allen and the faculties of leader batch are also good experienced. 

Thank you and best of luck.