Depends on your preference. I’d say opt for the one which you are interested in.
And salary wise, and scope wise ECE have much bigger scope than CSE.
The openings you see in Facebook, Google and all are BE(not B.TECH.) in CSE / M.Sc(CS) 
And about joining companies, it depends on what type of job you want to do, or you would do
But if you say in general ofcourse a ECE can join Microsoft, Apple, Intel, that’s what they need along with CSE’s
And about Facebook, Amazon, Google I can’t say if you work on Core Electronics / Embedded System Design or something like that.
But wait, generally these companies hire B.E. not B.Tech.'s
And of course you need lot of potential to get into these companies