Not sure what qualifies as a “top admit” but have to disagree with the above, as it’s clear that many colleges-including “top” colleges-use the committee letter for exactly that purpose-ie limiting who applies to medical school.
And reiterating what has been said above: it is virtually impossible to know exactly what any UG’s medical school acceptance rate is, since there is no standard definition of either “pre-med” or “medical school” so pre-med might only be people with committee letters and medical school may be allopathic, DO, dental, etc etc.
And as nobody has been to both an Ivy and a LAC, it’s impossible to answer the question asked. At best a prospective student has to weigh all the personal variables-location, cost, reputation, personal “fit”-and make his or her own decision.