I have taken admission in statistics honours at Ramjas College. Should I change to Kirori Mal College? Which is better?

For statistics, Kirori Mal College (KMC) is better than Ramjas College. Even if Ramjas has a better faculty for Statistics, still it is suggested that you go for KMC. 

KMC has a much better student crowd, better placement opportunities and a decent infrastructure. Keeping all this in mind, KMC will be a better choice.

Actually, both the colleges are at par if you are considering statistics as a course. KMC has better infrastructure and a better feel as a college campus. Placements are better in KMC. Ramjas has the best faculty in statistics with ND Vohra as HOD. Most of the students study his books which are also suggested by DU. The faculty of KMC is not that great if you compare it to that of Ramjas. 

But overall considering every point, KMC will prove to be a better choice than Ramjas for statistics, as it will provide the proper placements and exposure.