Hello,

IGNOU has a larger number of regional centres as in every state of India, under RCs there are numerous study centre  unlike in DU SOL where study centre are limited to Delhi only, IGNOU offers a varied number of undergraduate, post-graduate, pg diploma, certificate, diploma to name a few courses, but DU SOL only offers selective courses, also IGNOU has universal presence as in study centres are also abroad, generally the study materials of IGNOU are considered better than that of DU SOL,