Hi subodh ,
Undoubtedly btech computer science engineering is far better than BSC in data science yes under data science you cover the specific information like analyst or data screening but in btech course you cover all the topics . The average package offered to an data science person is 5 TO 7 lacs but when it comes to btech from computer science average package goes high upto 12 -14 lac also not depending on the college depending on your skills.

Hope it helps!!!