Which should I choose: CSE at BITS Pilani or EC at IIT Roorkee?

Today, CS is one of the most preferred domains and its demand is growing at a very fast rate in the job market. For anyone whose ultimate goal is high packages in top firms, CS should be the only choice. No other branch can fetch you packages as high as CS. 

As a BITS Pilani student, you can access the extensive alumni pool and develop strong networks in industries. Also, the CS placements at BITS Pilani are top-notch

I wouldn't suggest you go for ECE IIT Roorkee unless you are genuinely interested in that field and want to pursue a career in it.