Out of state UNC is actually harder to get into than out of state UCLA/Cal due to the cap of only 18% for OOS. Certain disciplines at the graduate level will be very different in strength between them, but if someone is OOS applying to them probably non-academic factors as an undergrad should be the determinant. UNC is historically the cheapest option of those and is often named best value for kiplinger’s ratings. I think they all are great and cost, geography, weather probably influence choice most between those. (or pre-registration benefits like regents at Berkeley). And if one can afford the application fee and the ultimate cost of attending, applying EA to schools like UNC or the others is a wise idea for everyone. In general OOS applicants that get into UNC will also get into one of the T25 privates too.
Also, the acceptance rate of 24% last year (class of 2022) is a blend of both in state and out of state. (in state is almost 50%) whereas out of state is closer to 10%