should I prefer Ramjas and kirorimal college or Christ University out of these which has the best placement for bcom as I am from commerce stream without maths
Ramjas College and Kirorimal College both comes under University of Delhi and no doubt there's no competition of DU with any other university.
Bachelor of Commerce is a most preferable course from Delhi University and lucky are those who get admission here as the cut offs always reaches to its peak every year.
No doubt, wonderful placements are offered here in these two mentioned colleges.
So I would always suggest you that if you clear your cut off for these two colleges that you mentioned then go ahead with the admissions without giving any second thought.
Hope it helps.