See BCA+MCA and BTech CS both are the best courses for a student who aspire to work in MNCs and National corporate companies related IT and Computer systems. Now every course has advantage and disadvantage. Likewise both the courses you mentioned are of the same nature. Now BTech will take you 4 years to complete where as BCA+MCA will take you 6 years. So doing BTech is advantageous in terms of time. Also the curiculum for BTech CSE is more detailed than BCA+MCA. BCA+MCA will only restrict you to the application part but BTech will give you a broad perspective from Microprocessors, Hardware to all the portions of Computer Application. Also Btech gets more preference and higher salary than that of BCA+MCA.

Thus you can see BTech is a all rounder in itself and BCA+MCA didn't have any of the things which you cant get in BTech. So if you have a scope then favour BTech over BCA+MCA.

To know more about BCA+MCA visit the link below:

https://www.google.com/amp/s/www.careers360.com/courses/bca-bachelor-of-computer-applications/amp

To know more about Btech CSE visit the link below:

https://www.careers360.com/courses/computer-science-engineering-course

I hope my answer helps. All the very best for your future endeavors!