regarding Columbia:
At Cornell you will likely be well on your way towards completing your distribution requirements as you head towards your upperclassman years.
At Columbia you would have to take The Core, which may constitute a lot of classes and they may not give you credit for what you’ve already taken to waive out of any of it. If so, that could cut into the number of advanced classes you could otherwise take for your major, or other areas of interest. You should look into this carefully.
SEAS is smaller, but socially Columbia is not necessarily so intimate either.
http://talk.collegeconfidential.com/columbia-university/1041703-4-years-later-reflections-of-a-columbia-college-senior-p1.html
And you would be starting over yet again.
My own daughter went to school across the street from there for her first three semesters, and she found that the lure of the city sucked the life out of the college experience. Among other complaints.
She found she desperately wanted a campus-centered school, and wound up transferring to Cornell. She preferred Cornell. Actually she loved it there. But she is not you.
On the other hand, there was a CC poster who transferred from SEAS to Cornell, and said he regretted it, he preferred Columbia. But he attended many years ago, and it turned out part of his problem was he was taking 20 credits a semester at Cornell while working several part time jobs. Plus of course he was not taking the same courses at both schools. And ultimately Cornell did not do so bad by him, he went on to get a PhD in EE (IIRC) from Berkeley.