well i would say rato ra chandra surya is definatelly better than sauyoo thunga. 

but i am a terrible singer and i think most ppl r so i cant imagine if i had to sing rato ra chandra surye with 50 other ppl like me who cant sing. it would sound terrible. plus sayoo thunga is shorter and can be sung fast. rato ra would take a long time to sing. maybe they can make rato for ppl who can sing and have time and sauyo for ppl who cant and  have less time.