Both colleges have their fair share of similarities and dissimilarities. Let me provide some facts about both of them, analyzing which you can move ahead with your decision.

• Both the colleges are excellent in their own way.
• The infrastructure of Science blocks is very good in both the colleges.
• Both colleges have diverse cultural societies. Players -The Dramatics Society of KMC, is one of the best in DU
• All colleges of DU have similar faculty. Some of them are exceptionally good, while others are average.
• KMC, being almost in the centre of North Campus, has its own perks. It is said to have better placements than South Campus colleges.
• The laboratories in the Botany and Zoology Departments of KMC are newly built..
• The student crowd of KMC, however, is not as good as that of SVC. 
• The administration of KMC is pathetic. 
• The hostels of KMC aren't as good as those of SVC. However, they are Renovating to make it more attractive.

Therefore, you can analyze these factors and compare the colleges, see what best suits your requirements, and finally go for it.

One of my friends studied at Ramjas College, so my answer might be a bit inclined towards it. But SVC is also a good institution, so the choice basically depends on that particular individual.

• Ramjas is located in the North campus while SVC is in the South campus.
• Ramjas is known to have the best faculty for Botany at Delhi University. They have a dedicated greenhouse for botany students in Ramjas.
• Both SVC and Ramjas have really good lab facilities. 
• ECA participation is almost the same in both colleges. 
• Ramjas has its own Model United Nations society, which SVC does not. 
• Also, Enactus Ramjas, which has been second in the nationals for 2 consecutive years, is far better than its SVC counterpart.

So, it all comes down to the fact where you want to live, grow and explore. Choose the one that suits your requirements the best.