I do think that the rigor and stress level will be similar at these two very good universities.
For computer science or computer engineering, being in the Ivy League really does not impress any hiring managers. If I were accepted to both Cornell and GT for either of these majors, and IF THE COST WERE THE SAME, then I would either prefer GT, or flip a coin, or try to decide whether I was more willing to survive the bitter cold and snowy winters of Cornell or survive the hot summers of Georgia.
Given that you are from Georgia, you are likely to find a big cost difference. I do not think that there is any way that Cornell is worth being full pay versus the in-state cost at GT for anything that is “engineering, math, computer science” related.
I would probably say the same thing comparing UC Berkeley to GT. Both are excellent. If you get into both, my recommendation is that you attend GT and save big bucks that you could, if you want, later use for a master’s degree somewhere (or let your parents just save for retirement or a few vacations).
If you get into GT (which I really hope that you do, given your great stats and being in-state) then it is a really, really good university. Hiring managers in high tech all over the US and all over the world know how good it it.
For all of these schools, this is all assuming that you are willing to work very hard for a full four years. None of them will be easy. All will be full of very strong students and strong professors (and all will probably have a small number of bad professors).