Though I should not be giving advice as I am an Aspirant myself. It depends on your interest. I appeared for both the exams(didn't get through though) and have talked to a couple of seniors regarding the program. CMI is a much better institute in terms of academics. Considering you are from Btech background, you might be thinking whether or not to go for MSc degree but if you are planning for a career in ML and DS then CMI is the 2nd best place to go considering PGDBA by IIT Kgp IIM C and ISI Calcutta being the best Data Analytics masters program.