Hey,

Both are one of top colleges of du but in different fields .

Arsd be the among the top colleges in du for science courses where as dcac be among the the top colleges in du for commerce courses. Well for making a choice between two for bcom hons or eco hons then definitely go for dcac. The comparison is usually done on the basis of faculty and ranking which dcac is at a better position than arsd for commerce section. 

Hope this helps.