The University of Denver most recently reported an ED acceptance rate of 238/310 (76.7%), implying a non-ED acceptance rate of 14281/18475 (77.3%), so basically the same.
One observation is in cases like this, DU simply is not getting that many ED applicants relative to non-ED applicants.
And then I think all this just underscores that generally schools are not going to admit applicants ED if they wouldn’t also want to enroll them RD. Like apparently about 23% of the ED applicants to DU in that cycle were not what they were looking for, so they didn’t admit them, confident they could enroll enough of the applicants they wanted out of RD as long as they admitted enough people (and offered enough merit, which DU does).
So I have never really believed in an “ED boost” per se. And I think these cases are illustrating that.
What I do believe sometimes happens is colleges may not admit otherwise well-qualified RD applicants they are convinced have almost no chance of actually enrolling, based on whatever yield model they are using. This could be waitlisting, or actual rejection.
Since this is not an issue for ED applicants, it is possible that sometimes an individual who would be rejected/waitlisted if they applied RD might get admitted if they applied ED.
But that is not a case of them admitting someone in ED they would not want if they applied RD. The premise is they would want the applicant either way, they just don’t think they could actually get that applicant to enroll if they applied non-binding.
OK, so if you are plausibly the type of person who will very likely get other competitive offers, and normally your type of person would choose one of those other offers, but in your particular case you actually would choose your potential ED school over those other offers, then applying ED might be a good idea in the sense it will communicate effectively that you really do want to choose that particular school over any other offers you could get.
If instead you are looking at a college where you individually are not very likely to get highly competitive offers (relative to that college), and in fact are really not highly competitive for that college by their normal standards, but you are hoping an “ED boost” will make them want you more than they normally would–I am skeptical that is likely to work.