I’ve seen many people get into Columbia and other Ivy League colleges get in RD with pretty ordinary stats but even exceptional people get rejected in ED. So, I wanted to know if it’s better to apply RD than ED in terms of having a better chance to get into Columbia because of the immensely competitive pool of students in ED?
It is generally easier to get in ED as you are committing to attend if accepted.
People with “pretty ordinary stats” typically do not get into Columbia RD (or ED).